Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a85e1e90742d355…

MALICIOUS

PDF

98.9 KB Created: 2021-08-02 20:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0223f1a2152f6aac6de2be5715728780 SHA-1: 815f09f4bbf1ed66e0b9fc93bfc605b35425ab80 SHA-256: 7a85e1e90742d355621ca9d1406d4923961e4ab0a323c186664dc04615d36e44
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/dad9f994e454c5c4ec320999951939d7/vofidorojimumanikitezawe.pdf In PDF document text
    • http://mamitobe.ru/files/file/jakadubid.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/30029887361.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/jufogovosemudakuribopi.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/52286474258.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072dfa2dca21---89673652774.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a15ebc785---8404572895.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/28090098703.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/bozanofugogumakewidosu.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/51006844920.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/82280734915.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/52321293023.pdfIn PDF document text
    • http://mariancozma.com/_user/file/36863732606.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/4afd03a98da759c40e2b5289392ad7c5/vizawefi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f50d5fa3efbb1d6a91f23c80035a2605/runofibowuzudufufojuxure.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4da20796b---kuwasora.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jezeke.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ea996ac2697838528c62e08efe1cac44/36904303880.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/taxiwusatilazetesijusi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60795304a---90483038355.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/miromaboje.pdfIn PDF document text
    • http://aweibel.com/Photo/file/wedumifupitobiwibebilogoj.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/poxat.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077973faee4a---dividititemukutevij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=halo+contact+harvest+summaryPDF link annotation
    • 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_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 17776 bytes
SHA-256: 17d52582abb26e346bf635228011c61a3ac19ca2cb59eb313059775c0cedb11d
font_01_sfnt_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 10672 bytes
SHA-256: 59ad8e70a06cc0941fdfe409f280bc369e5ccb8c664a3aed800417d1d911b7eb
font_02_sfnt_off0001661e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1661E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1