Malicious PDF — malware analysis report

Static analysis result for SHA-256 598d4e73fbd0ed3c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 13:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 19fa7a19900db6fb618e71e2acfe35ab SHA-1: 1fc540d51a21036a2fc6aa07a12405e6f6d94aad SHA-256: 598d4e73fbd0ed3c1b9e54b201ac2c22cfa7ca94e4933830fd9f5d30e11d50f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, including one with a 'formcraft' upload path. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=apk+auto+installer PDF link annotation
    • https://rt-totaalafbouw.nl/userfiles/file/vivijotivafimuni.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e06dbcecc2---21318864253.pdfIn PDF document text
    • http://receptlap.hu/files/revina.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/nofawosane.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/13634788628.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/vatamu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d389eb264---43865755243.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/14976743481.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/28845389947.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bububebipeso.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/mozelixibufolitunavep.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/jonudovamikimusixufaxene.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/3058479230.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/74426101963.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161356876985de---javudatil.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/8005248471.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/sigebepamusalowu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/tupimibumegadi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a90a9bc944---23299750138.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/22144097892.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/zesavotowukutopatunal.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/gepakixenuvor.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/ratijas.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0572dc7a7---buwonufebepusesawapo.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 PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 10416 bytes
SHA-256: beffdacd3773a1ef5ee84e4dffa80223b63c1d4727f424dfbdd7e93df1d93fc5
font_01_sfnt_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001091f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091F 18200 bytes
SHA-256: e9e76a1ad6f413ab8d988ebca977acc519b8c6ea6440a541ee7507a57bdaae85

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