Malicious PDF — malware analysis report

Static analysis result for SHA-256 2946806c4dc7747f…

MALICIOUS

PDF

91.5 KB Created: 2021-07-22 20:49:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88b89963a9525fbf77291b65f97a1b29 SHA-1: 82aeba28b72c1a9a529da455d2c232316f9eedc9 SHA-256: 2946806c4dc7747fce0b6c4ffede6f41682db4e59cee96f745c522c93b6ec281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct textual clues about its intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df4432b8505---95498421711.pdf In PDF document text
    • https://1877painters.com/FCKeditor/file/molipemepilurukexolezaza.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/77136747068.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cc3b8859c6786f67fc12c2c452979b01/91059115361.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aaceb778a---xixomowevekuleputumupiw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/v70ujpk1qp63csmmu4j0o2nvvp/60710694766.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/s7oh9t4sh3bh4recf0ebovrj5t/dituwobozojapobilerofix.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad5a3ef92---fitajezajexol.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/jatuzazebezakojunabowo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/91tf9eqnacq76n0rb5ba4tql34/zelolelakikiketureb.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/tutuwelisariwurib.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/funivukubujajuxa.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/pinolewipusibagigi.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/jafagip.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/58565cf460734c09a04c285f4a1c90af/puwowinuvifitakunam.pdfIn PDF document text
    • http://proxima-design.cz/files/file/gizifisab.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c13076babc---renofemikej.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918a7cd4309---61659953801.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/185dc4dd000756a57abd08c7962bc950/vikurifuku.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/org62i9qgajffjn7ildl7bl1v4/vasalufusarupodazinijeb.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/l1p43193j9rs146rpqk5g614fm/74181743552.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891df647d5f---92314307004.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d9a9f26c---zonavubigufovadupigizezi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160745426b6803---57046322347.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/fa364f564804f00b9be3ae630ecaea3b/kosagezevitugokomakeguda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=count+characters+in+excelPDF 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_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10560 bytes
SHA-256: bf137f4b989abd697c83a7ae328794d48764b7585bbcdb69f0ab0054fab05151
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13222 17328 bytes
SHA-256: 0f0d4f6cc16a08806650a2510665bfb92603df64ba8ab6abd3a47510c5cded44