Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd934f2b4842693c…

MALICIOUS

PDF

89.3 KB Created: 2021-07-13 01:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a2ca9fbf39d9619af9ad268d8f643d6 SHA-1: 47f2355c3e85d1619c0b2708f5fb0b285ef7bed8 SHA-256: dd934f2b4842693c93bb3d21e94f2659ba151a0d632826d75bdbb45154d416d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of link manipulation. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or SEO spam document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d4d973b0---mujebunewu.pdf
    • https://golf-tout-terrain.com/publish/page/file/fofuvewozujazujawojitibos.pdf
    • http://ginzaoakland.com/uploads/files/93553284523.pdf
    • https://bd-sokolovska.eu/userfiles/file/dararubegezonezujup.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d1d519052---mafotumojowusavaxadujo.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160897d7b64ca4---mapivijixe.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef506cfad---tobopigemeselekap.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/r7soa64pcab7ciljiop8spktmb/janibozeterutejikulalire.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd1a19b0cc---81847000006.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782468e0e43---6754730853.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7e18ab39---xebifuvir.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c38c8f4---pigugupakubenopozitej.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081d8019feed---pusopenomofu.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/55a875fd68bcffe65e8b043dd5519f67/97104507961.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/gakewiwamobuxez.pdf
    • https://bouwservicewinthagen.nl/userfiles/image/file/sililojanivunije.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/68129958796.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607726a0eaa11---jomizexunegugazola.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b8035e47---bivufanoziri.pdf
    • http://macabrey-luthier.fr/data/Files/wodalutitelakavevu.pdf
    • http://www.allatpatikapecs.hu/images/file/80408935334.pdf
    • https://fa-vietnam.com/webroot/img/files/65635036677.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/eo4sstitpjdsgnavs5hkviq4f2/2271204942.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3afee28104---49610941007.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609c01bd65121---29058825538.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eddd4eb5---24840478824.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779721c665e---bipaxixezorufidonojoko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rabies+shots+for+humans+after+dog+bite
    • 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_off0000f87b.bin
7bf456ebe62bde4c64dca7dff3638cb525699b9df91fa60373642f13f83c679e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11040 bytes
font_01_sfnt_off000111d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 16792 bytes
font_02_sfnt_off000129e7.bin
4af2306f47e0ce97a7b17a3cc96121b8e1e796f5a0fc40ac42b85b6d7835a604
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 17460 bytes