Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5509e31e1bcb5d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 09:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 697fc7fda37a3414f72af86ec2fa1c38 SHA-1: e7f8691dd5d57822f611d4e74994aa0dbd02048c SHA-256: 4d5509e31e1bcb5de095937c038e805a8b8d288f0dfc352adda11b6a505a0263
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or suspicious domains. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/6b32076289acf1defacbf265e863c4a6/zorofaduzul.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf730864e0---doxupozo.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/57911173779.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c9189894f98ceb5fcd93aa7ec09be23f/70854549503.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dd6f518538edb85c61ba6e3716f79162/tepagezavimudaxodivufona.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b894b84b2b392b0e36a1e32b58f5d61/79203914629.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/29ca3bf8b23c09b0c7c7bb1a3fcba589/27115168986.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc2b20161---sopopixoripuzokafepixure.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b4525e02a0818eefe2493ca56689b2dd/kutupagomota.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/48b09b76677fe48e57106b1a92f61b15/datujojulov.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kuska1uo7pu1pf4q6jiko45uch/zatuwenitukel.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/gatezaluvajadamixo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5d1e041e91fe30bce9efb66a4e6cf6bd/64479117201.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/77533338971.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/55ffeacf76dc75172c3e8a59a8a338c8/kamelujigapev.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6f39a4084---lazozisile.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f784cdced---zinojusoli.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c418c7887433f741b509d36cc3009532/rineledo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad8c5b245---pusogudawog.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/mazapozavu.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/80d72054e9991133e2646d6dde9b7e30/55727608018.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20ac311f99---zobizazelibabegefi.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dikofikasudipakebeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bounce+out+gamePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 10320 bytes
SHA-256: 40144a8ae33c796e318b4c4f568e15dadd172eca8565c1a55b978691cf1c447a
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17000 bytes
SHA-256: 3f0a075b3ed4a3d8c9bf007ffc7415860c860093d8efcd8f5996e0532d4627bb
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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