Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a19b1a76f9e64f…

MALICIOUS

PDF

67.0 KB Created: 2021-05-05 13:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61351fcab408919820d68f31180b5881 SHA-1: 8252378d93a6a2021b5156f06390c1c38065558a SHA-256: 62a19b1a76f9e64fa1ca8d5d4cc396a731f997bcb40d447201fdfa059757bd85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism to deliver malicious content. The document body, though heavily obfuscated, appears to be a lure related to an insect worksheet, which is a common tactic for disguising malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084dcf7a131e---26833994711.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/35ff6ac1d0ac0001e4e465c6355fdcf2/jodorutuvipuwoz.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/32545567245.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nfvbi0pb5c6ah3e49ult91alf4/zobejivemawen.pdf
    • http://aj-logistics.com/stock/userfiles/file/14292867884.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/mojave.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60907d370---woxejuvofibisisat.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2as1v6n0dodo40tk8hvdd8oee6/37384781195.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c6f10aa4460257d7e1f1e429dc8db588/25374520195.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f65ecd5eaebf1e15f88be67755ce7856/82598735649.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082936a1732c---pitapude.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608747fb452a3---kosefemilowojiges.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ea416a5c---42320170368.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/0c653f8d1e2e026427206596b7941bb1/vutuvakovutanoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dichotomous+key+insects+worksheet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c712.bin
bc3f319daa6eb8ce0bba1a9be6c62e3e2050327dd02dabb1ebbb8a36f865a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC712 5056 bytes
font_01_sfnt_off0000d83a.bin
c0d8627f72da8bbd91e2b120537cf73f8e5498350e385acd551d90dddf1c8918		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 11060 bytes

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