Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6cd32b4fbee025…

MALICIOUS

PDF

94.1 KB Created: 2021-06-27 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2bb891cd62f07c168cf11e2676d0375 SHA-1: 1b9359038696b7d42f0c609d0fdb495b12d66e85 SHA-256: 9b6cd32b4fbee0250a6cae3f07b578d85924df7d94df0ea2e2bbb466c6d883af
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The file's structure and URL patterns suggest it's part of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://laborke.ru/uplcv?utm_term=front+office+quantitative+analyst
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bdeef7b6---dozibelozenepamobenuvoli.pdf
    • http://allnatureint.com/userfiles/file/jivagobuz.pdf
    • http://agiusfuneraldirectors.com/files/file/65578613961.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/3e7483a4b538a4ade2f7cadb9616e6d2/12988410641.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81f60903b---27417176084.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/987658e5d050d447eab7d56a528b38ed/33752440357.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842c1657fc---gofoxunufapi.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4cb300d9---riperubekamewudadino.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/753f688f883a9831f946ccc4d60193fc/tejabojokaniwiwofofukave.pdf
    • http://kingnature.ru/files/files/55781569697.pdf
    • http://championshipsportsrings.com/clients/23492/File/7895988063.pdf
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gujituluzikuraju.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/429c46bc350e99405bb95f9d7d00ee17/nagapovogofafupanon.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21ca2d28bb---49635426999.pdf
    • http://kasargod.net/uploads/file/51732231572.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/47fcfab0db2093ab98d6d0b251f2c3d6/ludolovarevozojamaxe.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bdf28c63388532da7010a108c07b2d90/97101901915.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417f5690e2---47533962615.pdf
    • http://eko-inwest.eu/upload/file/90504773902.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b521be30---70092979200.pdf
    • http://bogieclassof67.com/clients/71235/File/sapizarotedebeso.pdf
    • http://munnarinfo.in/userfiles/file/21761482997.pdf
    • http://ztkammer.at/uploads/file/97095859599.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/876066f1ea248ddbc13ded0c47f51bf2/82936584385.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/3ff93ae4e44c40f4c960251e5b60f881/77315930061.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_off00010abd.bin
be2b0ef4f78668be3c308fca38635f5a12a210261d8e49c6e90050524f20869e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 10732 bytes
font_01_sfnt_off00012392.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 16792 bytes
font_02_sfnt_off00013ba4.bin
aa1720751710e832801438ec8d2c36df6c02bfb2515344c84a6054d272c3d060
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA4 17928 bytes