Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14530605de2ec0a…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 15:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a316ede640f2b7a96b064be8702b0f SHA-1: 232c323011153529d08a8b9477595282281b69f2 SHA-256: a14530605de2ec0aa00e9ed0002f03811849b489ed9b06ceed5dd8039612b973
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a multi-stage attack, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0449b5443a171756ffebe1384f8b7a47/kenobimasuvibupakete.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1341551267361b6ada3524778a59467a/50853690262.pdf
    • http://turnyras.lt/Files/file/63439582141.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/hthcu0lhkl80ehbg416ki9564t/9242622469.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160829daa36281---lujimep.pdf
    • http://driver-jazda.pl/upload/file/72356907551.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h17pap497h98t9p8e0je4m8f25/2004001588.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9a194d698---58670686715.pdf
    • http://rund.cz/UserFiles/File/13311114785.pdf
    • https://nestaerospace.com/uploads/file/ruriwobomelifuviwegibamu.pdf
    • https://vestol.bg/files/file/58937124330.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7r8ma8c3sd41j657jt6n9su9ok/39641486033.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1e5f524eb---14254280703.pdf
    • http://cuacongtudongbinhduong.com/upload/files/rigezumulavozemasimogo.pdf
    • https://atlastoursntravels.com/userfiles/file/71256815152.pdf
    • http://riskhedgetech.com/uploaded/file/1679953767609e68105c607.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55322f6d9---lipufevanusedamepojavu.pdf
    • https://laplacedesstores.com/upload/file/82347388321.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=soulmate+quotes+for+girlfriend
    • 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_off0000e611.bin
ff77a905d1c5171531a42ab166be9d16866659d6db502585c94db824dff1c00a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 16812 bytes
font_01_sfnt_off00011143.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes
font_02_sfnt_off0001295a.bin
17b5cda8801db05a0a67e144a12069dd8a617848bc9c5e3624160cc4c388be27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 11020 bytes

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