Malicious PDF — malware analysis report

Static analysis result for SHA-256 f004b155e92461a7…

MALICIOUS

PDF

74.0 KB Created: 2021-09-09 23:45:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56a4bd6d9b977521d7b70e501634b927 SHA-1: 557b36b3673fa47e729d36dc8123efb713274e2d SHA-256: f004b155e92461a7cc5a0d3721d80fb22c3d5b164dcc9644bfc8690c853e9379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=super+diagonal+mario+2+rom PDF link annotation
    • http://kitpaisal.com/mypicture/file/42090787344.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/ruvebise.pdfIn PDF document text
    • https://kawanmto.com/contents/files/gesotejitigeguseta.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/wajuxufogikufoxagibiso.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/76869231068.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/15555760888.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad269a35a---72944945720.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2f0e26f8---gubuzidewe.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/69952333546.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/74728628726.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/zokitisodezeti.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/57851647888.pdfIn PDF document text
    • https://hojoairport.com/images/file/kexulevumusasi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a06c58ce7---95885757432.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/vijadisinibasolitodenus.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/jilulidagilaxemupivaxovu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613447a7ca02b---39871378507.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/2857717285.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/biperede.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/564sj0q9rids3t07u10dmdjd86/jirita.pdfIn PDF document text
    • http://aurora-c.jp/files/files/xepotitatopejotixuxidasig.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcec0e08c---96140657504.pdfIn PDF document text
    • http://teplospectr.ru/images/files/34325805746.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/55041035122.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///41073780984.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_off0000bdf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF3 16804 bytes
SHA-256: 214fdd9f38b70e0fda4d8a62d33d27f57f7a737c06d92ffe5bb4ee907f5369eb
font_01_sfnt_off0000e97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 10764 bytes
SHA-256: 3daafa08ace9e3c1d68a0d0929948c3a1ba5b4d2c9849724642a1793a1adfbc5

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