Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d587f7cd0b235b…

MALICIOUS

PDF

98.1 KB Created: 2021-08-12 06:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d18b8239426058d88bc7cca33da43811 SHA-1: 135cc49a9cb7d378d5a569ef5abd65c21b4c9d9d SHA-256: 60d587f7cd0b235b8dda4ec44111f78adae241b24f0c086f74ba4c5258d10ce8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious sites, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160935a9a6a50b---kujijapajefebomepojudo.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/733fe7d7dbfa4f5f81285adb35cca88a/13444086502.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b789434f---29785702253.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd287449eb---10292298007.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5ab57190ede3fd627d956b13cbbba631/29790230814.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8gjg8fb5ru1qfdudn01137fdq5/rogil.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/4eu6q6ap39vsbrie0vukeoe5tq/33350346662.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/gi82k0ji2ganto5cu3356o0qj0/mipanevusukunab.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbd01f4b---megatonotesulapipavawip.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76b23bc06c---zewukujiwebaralunodasesu.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078367c40372---kanozutodinezulakavowov.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/30b5af0df4d75cd2518347f4a73d470f/48753779634.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/16770873589.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/ninudub.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/73201878101.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a27db809fcb---sufebufaza.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/40977927808.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/tozujos.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/66021120014.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/31188527630.pdfIn PDF document text
    • http://cy2hand.com/userfiles/46905339314.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/77365368173.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/3806505266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minn+kota+i+pilot+remote+guidePDF 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_off00011843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11843 10752 bytes
SHA-256: fe831324d5fe39c5ae8dac8961203fa23e14e591d32cff8cc055794da3f82ec3
font_01_sfnt_off000130c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D2 18336 bytes
SHA-256: 63c4ccc9a4638764edf9232611e23f2bec5cfa27cc21947b791aaabc4dc78b43

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