Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf08e6ac37de00f…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7559c59da3a5d84bfa2280258ad84c33 SHA-1: 312a8fceb5d9ef61429ac332549a2932257409c9 SHA-256: 1cf08e6ac37de00fadd1cb38b33c3bf5535fffc191ca4ebdbd19cffd1aa8524f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm for SEO poisoning or phishing. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond its structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://protradingindia.net/userfiles/file/favutomopixikutulapum.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099996c0f5c8---xupemofoposesitijonezugor.pdf
    • https://leosservices.com/userfiles/file/28708605961.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9df73bbc15ad1e7ac595273b048e81af/mojutebomebikegarem.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/tfut2fj7t4oda0mga6n6evo4bg/64456622649.pdf
    • http://ventilatoryzlin.cz/images/file/donefevufu.pdf
    • http://atol-res.pl/uploads/file/48153215377.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ca3a7b54710f5201ad6bdae79d8480a7/xeguxabenofo.pdf
    • http://eltonltd.ru/sites/default/files/uploads/29711826191.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2bkt9smqiuupok3je57dnfcjqj/19763165724.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8fc995654---21352990843.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9b7fe3772b5e3ed368ad98dbc9736c1e/gijokariziwixesunubo.pdf
    • https://ahreco.com/uploads/news_file/viwipamiraxitak.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/35b3127cad6808cf5e93284ec53ce55b/tiwipovuvexomub.pdf
    • http://willbramephotography.com/kaxudogavaw.pdf
    • http://a-swiss.com/upload/userfiles/file/42638430519.pdf
    • http://berbun.com/user_img/file/77554957587.pdf
    • http://i-harmonics.com/upload/files/mobilaxegogoteki.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec70c6f52---newekoz.pdf
    • http://aftckwt.com/uploads/file/5288224725.pdf
    • https://biocoils.com/img/file/83852342414.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/643d0b591272752fb7c9754742461201/nosinegaxugibunugeg.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16247672891776.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+does+the+duodenum+buffer+the+acidic+gastric+chyme
    • 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_off0000ea50.bin
9379ea4467f3a3e0a7a23510e3c1640c8ba1039036bf2d2e894e108cba7097f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 16224 bytes
font_01_sfnt_off00011453.bin
e03d68708935932ea66268caa6aabe879c7f9c0f2f0bff681faf0b417942d4b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 11308 bytes
font_02_sfnt_off00012e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E86 16792 bytes