Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf9d711e5c79e63…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 07:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd5f786a4cf9c77d820818b79e164a54 SHA-1: dbd55c113baed0a3476899f8ac364c2f9e62a79c SHA-256: adf9d711e5c79e633ca952bf86d784ebe91abdabcc52ce8b101590a7eaa42a14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://krisoc.ru/uplcv?utm_term=astrology+dice+instructions PDF link annotation
    • http://rauvuonsach.com/images/uploads/files/pazidem.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/avpmsjkt32p2sf02qd6vqdr07g/54841993990.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071979911227---letus.pdfIn PDF document text
    • https://phr4u.com/files/1903214393.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/86804029773.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082594167ece---29905198181.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/wojalolanedevagobuze.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607797e208c97---81543420389.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/552cec028792c39b5c707e151fdbc629/31335026560.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/q54b3runjifbp78je7q0pms6k3/murokokazirale.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c75e8ab1c90948704b81d2083e40b3e3/6621479038.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/68c2a9b3f88e6f1600bcea0499b4ac6d/ponawo.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/zibesidonasiru.pdfIn PDF document text
    • https://samowar.ch/upload/file/zojoxugobodanururovuzoli.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160925b02254b4---65233131274.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/11220187741.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/diwuzido.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/73549e6630a22b7fa2b6a14e7f9695b6/87143906159.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c90e8a8eaae840e9ba2330c4699a3d43/3166837988.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7a58a1018d89e41d0b8a657670470cf8/wiweza.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210710115458580.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/nakerapufewukazu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/negifekanuxugiwexotupo.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/6780747508.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/hd0asnthp88hjadl695k3ft2s0/61050838386.pdfIn PDF document text
    • http://www.bash.cl/media/file/81620631575.pdfIn PDF document text
    • 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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 10580 bytes
SHA-256: 3bedf97a478a345d965afc596375ad274d88cd1a527881d2a1af57e35f786154
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 16868 bytes
SHA-256: 168b341a72496ea539d3fd8121e9f7288db0d99dd86156bbceb1d6ec4b73c7b0
font_02_sfnt_off00013c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1