Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c50ca2ca40ad858…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 11:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be94dea985b2aff277f278aeb5a1f73d SHA-1: 13089010ce15c78c1f0ab7f60226906b8c289ebb SHA-256: 3c50ca2ca40ad8588368b26e5b50b8f28649a3f9abfc2f927bbd9122b6adf2d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external URIs and link farms, many pointing to compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure and numerous links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=poco+m2+pro+vs+redmi+note+9+pro+camera+test
    • https://butyfarm.mm520.net/userfiles/files/bifagodibufojogidu.pdf
    • http://htbestcomputer.com/media/ftp/file/zemukaz.pdf
    • http://akcjonariusz.com/UserFiles/file/salap.pdf
    • https://thefertilizergranulators.com/d/files/nuxerumisadokavive.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315bd51e867---dupulimuvexogezixed.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/21800165609.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/tizajekalizazoduxapu.pdf
    • http://scard.vn/app/webroot/uploads/files/zajizutobadava.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/moduxibumolewusujaxivep.pdf
    • http://marketingnews.fr/images/file/49588739448.pdf
    • http://mayingiabao.com/upload/files/49409943342.pdf
    • https://cissud.com/uploads/ck_editor/files/65731067748.pdf
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/69660063072.pdf
    • http://immobilieninvestors.net/userfiles/file/rafof.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9ad0549f45f3aab2c8b6135861f0945f/putewuxured.pdf
    • https://idealist.ro/userfiles/file/48593344782.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zakofeguxutezitumoxojoge.pdf
    • http://www.chubsorn.com/file/files/41100005028.pdf
    • http://malagi.pl/user-files/fck/file/zebovexijowut.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613081845a430---25592419366.pdf
    • http://centonze-vini.com/userfiles/files/83725159126.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/gorokusudaxakiwumi.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/pikalirok.pdf
    • http://glttek.com/userfiles/file/gitixo.pdf
    • http://www.tokyomagic.jp/images/library/File/87565645175.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a16170bd0c382cb07818b1576c104489/lopobebipuxurorugonemom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38a.bin
19a093caf3faa48eb066a735885fc2f626f869572cc2fa6beb258f4f8c2f9b92
pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 18936 bytes
font_01_sfnt_off000114b9.bin
41a6be39d6ff5d7d02fbe689b0c3bfec0ba7b88b7a5562bdebb85ac52752db10
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 10984 bytes
font_02_sfnt_off00012e51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 16792 bytes