Malicious PDF — malware analysis report

Static analysis result for SHA-256 e974c13c315c6eaa…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cc381819fc99940e002e32f631181a16 SHA-1: ff3717aa2e6f5ae9fd7b4bcf84513cfcda8e21f9 SHA-256: e974c13c315c6eaa0aa43dc98750079b5df861f59baffb2635ad3105bc3826db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=remorse+for+wrongdoing PDF link annotation
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fa102411c---lovogarililodubo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7tqsjh4t5kohirbh98vou27gc9/48393032522.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ogjn475aqcscuh62dvn74np3ce/karemakewibuge.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/73047449253.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/77956a15ad80a4d1bb347d0b07d6f48d/pipikaziso.pdfIn PDF document text
    • https://partner-support.net/user_data/userfiles/files/galiniri.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1ad65a831---vivutup.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/edcm690eb9smtkvk4n26bhrtn3/71185273365.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/16025225182.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/26721264480.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i7473r92gr80tq2rfdq4t65ljh/buwewivevumigid.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd03256079---67702698484.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e7a50bc8e625b6b4ca67a91a2a0d18f1/batodipeburezavezijutere.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ddfb406cc3ef3bcb15e856a27045ef27/xivapifosajedado.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0b3ab77c---68507818252.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb77b0358fe---15803202202.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e03e11ac---89687811802.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5187a7b186---gowubajanep.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/tekuzibatap.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/23978800915.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/42528557027.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/tigiv.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6j7eu6mlarvcpes21mbqhculk5/9016720389.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/39209648661.pdfIn PDF document text
    • 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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 18960 bytes
SHA-256: e5d0b9510005505a1dacc2e889406e92d4d7b3a34cc59175d4e4a4ada1e6fd4e
font_01_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 10524 bytes
SHA-256: 47f30968b678c4659e3876847a41512b61b594b21ebdd3e9831c217baaff4a10
font_02_sfnt_off000121f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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