Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3bf2be7eee3523…

MALICIOUS

PDF

133.3 KB Created: 2021-06-19 16:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2a204f617657e4522b2180c2f51806b4 SHA-1: 266af05119791031b1b27a584e28aa051b7f1a1d SHA-256: 7f3bf2be7eee3523de6eba6033877ee29973974fc6b82b968d73ccb621891035
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host or redirect to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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
  • 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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3vdi3dp83mt0jcf6drcgaj2r4/96914090095.pdf In PDF document text
    • http://momsystem.ru/public/file/55374875446.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/933ce9f8ea84e73a669b638310c770df/85081080829.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6e6c65613---vavik.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/67o55b9unsal93i0ctj73plb56/demaribizenumatidul.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0eb0e984---mosekenegamag.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe6e7515---28263076919.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c453958f904---tileworirikapuwajesidibel.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/14499358476.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7149daccc---73104662382.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/94642740065.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1bf94e6a447e8cdb4d39aaa698d0fcb2/97987952562.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3106fa12731800fc9ce8df0a267fbf36/96944339915.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/80450782941.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2d534a703d2b9a033248e234877cdaba/dovajotexibugo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb886c33f7---92662263755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ppsspp+gold+iosPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3D0 4820 bytes
SHA-256: 8ad12cafe924a322dd96350343a5294dd1b8a6e8d5ea7eaa92eb61007d6eec79
font_01_sfnt_off0001f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F44E 11816 bytes
SHA-256: 352aec84f853bfba73d40c7d98a1a13143049d3d4ff05fa85eb4b0c3dc406714

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