Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa4d8cb21ebbd7a…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 18:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46d05501816bd9110cf0d9a7b46bf7e7 SHA-1: 7b88d50945ec9dfc4a08d91a5f76e5232d34385a SHA-256: 5fa4d8cb21ebbd7a767dd634328f6e29d13eefb91903a72d36f53dd24d35e73b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of numerous distinct hosts and the use of disposable hosting indicate a tactic to evade detection and distribute malware or phishing lures.

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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b36cfe9cef---42107274852.pdf
    • http://airconbank.com/upload/fckeditor/file/86083974045.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6872db0b3---57735391088.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/j56hb98ek5p6nkl2t6em18rqk0/fufopenojuzinuzuzeb.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/jebujebejurowaja.pdf
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/nukewulujurigasurux.pdf
    • https://prtl.pl/userfiles/file/56182664428.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/694d75d250818c9edcf29731368f833d/72105617154.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/begejokorufida.pdf
    • http://bularz-auto.pl/images/userfiles/file/ruzamunawuveg.pdf
    • http://vyveva.eu/UserFiles/File/62770757480.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f052773e86---nelodurivut.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/of3565g3b9desjhh9nak0j5l3b/43341440242.pdf
    • http://amon-syotengai.com/userfiles/file/kawexuvewivixavu.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f901dc559---budaxopiripebibomizu.pdf
    • http://wsm.hk/images/uploadfiles/file/61723342150.pdf
    • http://patrick-vallot.com/upload/files/63268538173.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e20ca4caa---68323499044.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3baf9f4e3---jaditematonosigosupomofos.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609658b574edb---72707447731.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/3b318a3cb2409b53ce3c3a0f6f1ed979/43888687908.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/555de298bb3788c3f8a71a4dd4754082/75792864796.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160983d9b4fdbb---61464748805.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f8648534---9343200350.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=barbie+and+the+fashion+fairytale
    • 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_off0000eeb3.bin
b3f267e0eaac2fa1000fa21d9b025140773fca131cd063b46d5147c07c5e91c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10756 bytes
font_01_sfnt_off00010765.bin
cebc50a8456b9d45e445f6cfb6fc8b91f750d59f70f75a24148835290f1723d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 17324 bytes
font_02_sfnt_off000134a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A9 16792 bytes