Malicious PDF — malware analysis report

Static analysis result for SHA-256 a886ab857a096b3f…

MALICIOUS

PDF

143.8 KB Created: 2021-08-25 10:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 66136f4518b3e1056d6b3cc025facda0 SHA-1: ab0baca30a87c4d34acfeecaa9b7789ab5bf2860 SHA-256: a886ab857a096b3f556cacbff529430e3c908fed06e915d590b0d3d8295dfbfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress upload directories. The heuristic 'SE_INVOICE_LURE' suggests a fake invoice or payment lure, which, combined with the link farm, indicates a phishing or credential harvesting attempt. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest malicious intent, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a134a2580---5558994368.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/782c1d70c69c3bc7e46fe081930295c4/44214067643.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/38226395934.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/40067184848.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/56923557705.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/69d28b90e2de0be82075e9c507c7b327/desakol.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/47652847580.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kolufopilerefukumojagagi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886b1bed071---89705344900.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/36738091347.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/b0830f51085d154449e5762c2958f934/93320921275.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/59247936693.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/76400231869.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/87913429639.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/8095beaf7aae1f20b65ef49b4542d3ab/baxomox.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/03c0b8e85769aa0bc6c5311f737d801f/nudizove.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12602547006.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/29479224975.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/19764690972.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2ba386ce2---kavulonabadamudu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q7po5fckv4kre6pdhhkpmmnt07/xexikefemirojajigopedo.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/45413578928.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/gunutodufovogagiwefetipep.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/nitiwelun.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/86886924286.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d6585b5da20---99785580534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=financial+markets+and+services+notes+pdfPDF 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_off0001d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8B7 10916 bytes
SHA-256: 2db04f4da7e69b611ce47ddc8d65cf3eeecfa750a2944a2e9a9cd1025a24df33
font_02_sfnt_off000201f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x201F6 17888 bytes
SHA-256: d42f484b21024f1f22cf970b70fa649bdc782374e4f995b7460bed94afa61b2e

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