Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdab2b18c70728d0…

MALICIOUS

PDF

93.3 KB Created: 2021-06-30 03:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d30685e2b035435255dca31fd835c89 SHA-1: 1083e8bcbb69bf83eefbe3e54c297f706fcacab3 SHA-256: bdab2b18c70728d045bb6fc82f851ac03d64737ca6348e396d7c37dc121172ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable binary data, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://majorpropertygroup.com/userfiles/files/64078755197.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a433943e8a0---5188617740.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3220eaeb6303b895d71f87bd5f8ccdaa/99255073338.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8fced20317edba2a1f403e189c0b1562/67815350344.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/feribunaxow.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b2fc21f4---fikizopamopejomabo.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5d19686a---35055510196.pdf
    • http://delve-cr.com/uploads/37909201318.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05c197abe7690316f12fef89fb240570/gigejujifalokafoxuwugipe.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kpuer08k4gv58fo2fpauuuan0b/vuzagewezilawo.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/16d9fe7ac12cf10f0ff256d962e64a15/83614933565.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b76c700596d---fituzabepilukeraji.pdf
    • http://studiolegalezullo.eu/userfiles/files/41642276215.pdf
    • https://liderpin.com/calisma2/files/uploads/4910674938.pdf
    • http://mamaskitchenorder.com/uploads/files/vefevozofikutax.pdf
    • http://aurora-c.jp/files/files/dazuzibuditurawagixu.pdf
    • https://appfacile.it/file/40756236703.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608de4677da23---vepovokad.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085eeef620b1---wanazulunabizap.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4fd9dac68f2de0e67d78937aa5e36204/nevugelaga.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a12b3927cda---zimiruwuvifizuferevum.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f60bc16a6a---57667774924.pdf
    • http://bannermaul.com/userData/board/file/zunajetuzijogopigutumibi.pdf
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/lepuwatedatefor.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffed4d9db---71901797720.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=get+blood+out+of+linen
    • 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_off0000f31e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
font_01_sfnt_off00010b35.bin
a267f2850b0bdfd43e7775c18a03e0584006f00234b6898a2b6cbf3637b604d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 10196 bytes
font_02_sfnt_off00012218.bin
74ec64510c3eea2dd7472c071a4e41baa49997710a3b602fabd50a07fb1f8b0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 17200 bytes
font_03_sfnt_off00014ee5.bin
5c364c81a7fb26b682e528dfb9bb2ec7b7b3075c787315c09ee9bd972eb38d11
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EE5 16576 bytes