Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472d819e89ea7d1…

MALICIOUS

PDF

85.6 KB Created: 2021-06-26 17:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44285ef3efe15b5403e8ac39a3f326eb SHA-1: 7548348f7195aec7307654b48b6faf2383b90cbb SHA-256: e472d819e89ea7d1e03d7abdcec5a4c5584a53abfb013a965f8733c2832c3569
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to compromised websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://inwebjor.ru/uplcv?utm_term=monitoring+wells+for+groundwater
    • https://sinhadventure.com/uploads/file/52801855157.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfc17ee22---zarijogidagogaj.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160702c9bba106---jugefi.pdf
    • http://project-lovcen.me/userfiles/file/59029628673.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be00195833---bofibewisuw.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc428df3a0---68263920257.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c2de4abf3---noferodujuzo.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74bf4120c8320c264d2b96aa12e8391a/48419967637.pdf
    • http://akcjonariusz.com/UserFiles/file/74273852923.pdf
    • http://rhondachem.com/d/files/24340103008.pdf
    • http://fashioneducation.ru/userfiles/file/gamitipisuzuna.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903f8c27320---94513970904.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/kuval.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/mukigijitawufakuvobukusa.pdf
    • https://an-professional.ru/img/files/file/24422847927.pdf
    • http://constantcontinuity.com/membership/data//files/kudewulogexodejupagoruzel.pdf
    • http://tokyoto.pl/UserFiles/file/likuxuwovezogikikite.pdf
    • http://bright-mineral.com/uploadfile/file/2021052502341268.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9b42889eed2bfcba9d64c3372b965bb3/kowaw.pdf
    • http://accessprecision.com/userfiles/file/texazinux.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0ec3deab71fa481e6f224ec9578d2800/42254400297.pdf
    • https://addsfly.com/userfiles/file/rosijoxodizo.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160838c5b33f6f---24713431284.pdf
    • http://andlupa.com/userfiles/file/jodud.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/32d2e39ac0769b6bd03f7c7bd9f98632/jubuzez.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e485.bin
647d56b3012ee3780c3c003ad85fe1480026261326b88c6246dad5de0aeb4711
pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 16908 bytes
font_01_sfnt_off00010fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 16792 bytes
font_02_sfnt_off000127c1.bin
47ffcb3349fa045250215799b8e82eca1684b8ecc7f0f7ac8f6b3bcfc244e058
pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 1732 bytes
font_03_sfnt_off00012ffe.bin
105c388b31335a955e3b86fe6d57e09d4fb99a4b7a64a600965bb26d86057008
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFE 10708 bytes