Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3402de58b8b537…

MALICIOUS

PDF

87.7 KB Created: 2021-06-30 01:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 405f0f8e41a916483b2a5bf993e96fe1 SHA-1: cb01e4d1aba979e57b3b50eedf4063992e8d7ca2 SHA-256: 3e3402de58b8b5372eb246e276fb049ec24cbb6c5f065eae8b13794c6f11ace3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://nowyhotelik.pl/userfiles/file/53663677153.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608563f28d231---guxakagorogebupan.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a8287814e---93170495767.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addd92f3fe---13765821163.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac745cf12ee---luwomabideniwejose.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a49dbc26a2b4dc34f2247c1a58a3a208/20991509276.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6d518082---7130716602.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160be00460688e---9199789196.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b26fc53bfee---viwagikeludobini.pdf
    • http://sattamatkapatti.com/userfiles/file/26009711876.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa65505df---90810648683.pdf
    • https://2acontractor.it/images/file/89547201275.pdf
    • https://latework.cz/soubory/8867441801.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099adbb91710---60260567988.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160af1297a1f39---galinobituf.pdf
    • http://martom24.pl/martom/userfiles/file/38294621358.pdf
    • http://riccaassociati.eu/userfiles/files/21404959900.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/98cbae2aac7efa9c4b16251d660f9887/6252557429.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63f3897c9---58134601137.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d77b31e55---pajutopunedik.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/fc11a7b13d01cf6b61b405b63dbec72e/wimusidora.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077febad0284.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4a003491e3ba6dab0efca0841431ddea/59946651437.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fallout+4+dogmeat+lost
    • 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_off0000f453.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16792 bytes
font_01_sfnt_off00010c65.bin
ebaffd27dd2f4520487dfcd3389e17813c8a1c4abd199a631969286f57e16aec
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 17488 bytes
font_02_sfnt_off00013a34.bin
79efb8f31747ed6176f991b0e308ee415cdd0d84bb4820803e12a0b98d41ab19
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 10452 bytes