Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab0b7688bfbbb8df…

MALICIOUS

PDF

83.5 KB Created: 2021-06-22 19:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b24669aad25c01efea363da7b419dd8f SHA-1: 521a181424958fb0aef5031b5f500f214fd47c48 SHA-256: ab0b7688bfbbb8dfe151a135ce0a8acf8be55e33611e5e9f3b9f990cd94eb24d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings suggest the document is part of a link farm designed to redirect users to malicious content, potentially disguised as a free download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=lkg+ukg+books+free+download PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3961af64---44541594790.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/h7o42gf8b1nc6fm0b2nv7r10s0/66401942.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/54593738914.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/9ec007bacca674f0512e1c4b9dffd6e7/wumotu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160835797dc98e---97706031025.pdfIn PDF document text
    • http://whatdwellswithin.com/file/80027868062.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b74ceb8f---mivufijuzedefo.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/panubinuxetuwisowinanow.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade2208f71---zeruv.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/15268959973.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839ede51437---23013037326.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/fd6bb32f3bedd56bb8079dd647368212/jivinu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160837d22178dc---suxemotekaw.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5091d38d---pisesemuxa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f93ddb8e1---74499027141.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/pixiluvenokapulogaxi.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f13bf415e101f7ad97d70ec56456af0a/97028237288.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 5064 bytes
SHA-256: eaf2b37da88fa6006cd881f1f237d09b0e5674252c59aeb4c58fa5a393877858
font_01_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 11404 bytes
SHA-256: e9b84f6b261f6e143ac22356efbe7454d3e5855de0c81ab4537fec2770c83452
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e
font_03_sfnt_off000132b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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