Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f66fd59550042fd…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 00:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 586fdc95d784b99d153c07aa3a3105e0 SHA-1: 0bcf765ca38d299214f875931b3da1736bd5d158 SHA-256: 4f66fd59550042fd763503060b62753b127f5326712ee54ac98a65c89bc801b3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of numerous links, many pointing to PDF files on various hosts, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b34aa8c0d4ca58f06ea56f16474da6c3/vunobivadomatukaboter.pdf
    • https://nisahanpin.com/calisma2/files/uploads/81475803181.pdf
    • http://dissanna.com/temp/fckeditor/file/mupolodatulojamibopupebal.pdf
    • http://kraski-chernila.ru/resources/file/kemewusetaw.pdf
    • https://seikai.jp/free_images/files/30258872901.pdf
    • http://phrabat.net/UserFiles/File/14174116130.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b61ec1aff---nevotopimugubebaturagepu.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/lrdqch3emcjalqf13b337oi7ub/89577649057.pdf
    • http://csptech.net/admin/userfiles/file/50891885807.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c605db91857---fezudapavapogobetopi.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ba14037bab6---42686345219.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4af9c385a59b4d126e06e753000f9fd0/42033836692.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/65sevn68lrs1aij04jobkrev0e/8596309257.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f763e6c2f---30702685398.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e86f9cdf95616cd416ee56bec9511073/99458032660.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kq4spku15mrn0edmf97ur0qc12/tafisovepurevegosapamej.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0222e1624---vunejimaj.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081219db9c1a---65467302767.pdf
    • http://aweibel.com/Photo/file/bimezum.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50bf472bb---netogibepalomokejoxuma.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/7359854416.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/281f624c7afbd29e231deddef348bbf7/36176802388.pdf
    • http://alpha-th.com/userfiles/file/zuxebijoserasawikobi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e26429a84d---42724103958.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fe567637---2916062544.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=force+table+lab+report+conclusion
    • 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_off0000eef1.bin
fd9159a8e3f675d0b893bd430753645de93fd593818bc06e7a40825c5e48605b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10584 bytes
font_01_sfnt_off000106f4.bin
41f4f484728bf3767985917bddfb76d31c22f4017d73eb9544b65068c0a997cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 19032 bytes
font_02_sfnt_off00013719.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13719 16792 bytes