Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b1d2eb21c4e0d2…

MALICIOUS

PDF

178.9 KB Created: 2022-02-24 05:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-06
MD5: 25ff47f562d542c28ab442215695b948 SHA-1: 39907bf268e78d7b46418c1eab4ee2888a1cebca SHA-256: a8b1d2eb21c4e0d2ef03ab3ddfca6180d95de77eac9759aa3f38fc396d7c7749
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The 'PDF_ACTION_PARSER_EVASION' and 'ML_NYX_PDF_MALICIOUS' heuristics, along with ClamAV detection, confirm its malicious nature. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7805

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://norin.co.za/XSRYdR1H?utm_term=free+clip+art+heart+template PDF link annotation
    • http://austral-immo.com/userfiles/files/mexebokuwifurujatuze.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195513303821.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/jepazavinojumo.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/46326154920.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/46342077934.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/92209591306.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/dapelikadapuwob.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20211204_BFCE6E80178A550F.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/26088014851.pdfPDF link annotation
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/21600768a5e68fccc176735aeef12dea/kulixomunanezexukenid.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/wotugewapogobazizexobuvav.pdfIn PDF document text
    • https://salonrewards.ca/images/file/gavewaduvaroju.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/62728953785.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/fadaledabevobusuzenipiwak.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/31709736270.pdfIn PDF document text
    • http://creacionesfullpack.com/kcfinder/upload/files/juzuxopevamuregira.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/44694169910.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210829234947.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/7pmillvak35r9e1dju0rqg9a2u/94450445270.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/54859226086.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a23d7d62239abfa8be1de5974558e007/19577241989.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/99071116659.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161e6347eea437---fisivunid.pdfIn PDF document text
    • https://mail.conepe.org.br/public/ckeditor/kcfinder/upload/files/3302528789.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/mamelerekuki.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/jetazumaxabonibuduno.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/1609591282.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161aa20bfb74f1---jinusuginulufafijezuzovi.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b1aad10b2b6bcd7de68202427c08db62/3198446466.pdfIn PDF document text
    • https://rozetki.su/kcfinder/upload/files/2092159296.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/jadexupofamuvuguraxe.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127240750d69---2996377733.pdfIn PDF document text
    • http://saint-party.com/media/file/vorutofonipekajomek.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/24832967365.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn extracted file (font_00_sfnt_off00025f6a.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00025f6a.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00025f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F6A 10224 bytes
SHA-256: e42d674605a453c52edf2d4cf135c8f41d20b20fc465c95a4d4c06453e2b74e3
font_01_sfnt_off00027646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27646 17812 bytes
SHA-256: 118d79c651fedeecf824c28af27119b0c9ea71ebe1d76415d88f293249e37e12
font_02_sfnt_off0002a46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A46D 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9