Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85070ac8b6a9b62…

MALICIOUS

PDF

63.8 KB Created: 2021-05-10 08:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41e0e9290c4c64170f8a3a650ac42662 SHA-1: 0314260f67f696bd072951947c75d439a7deab49 SHA-256: e85070ac8b6a9b62aac3e61cbab5824eaa438b221ef9c9008690db18f526833c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098573b4e608---13459706637.pdf
    • http://dok-vo.ru/userfiles/file/79810076057.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/290db96397a3cd4759b90f37f8604ed5/fagoxo.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c69172826---93968619886.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16084be1c795d2---88787092184.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/98684660650.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/350d20083100fa2d2c02c701647d1df3/wanodirazuvi.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/e1ab53afdc477c5e4dfbe4d223194dd7/94835012880.pdf
    • http://anhbanglaw.com/userfiles/file/lepowutoz.pdf
    • http://stlnsk.ru/uploads/file/gulefazegupobobakubelaf.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m5p5caium2ebujov0gnrl5hoq3/79864691214.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac8acf8e8---52911971275.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d1083497585f4420d1ed986f1ba6f09f/38803920158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=physical+science+grade+12+study+guide+2018
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c494.bin
5ba32be502b2457c33d1411df1c37401357487e0f8a64a57652c8721ef460633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 5824 bytes
font_01_sfnt_off0000d866.bin
b98df4a7744913755a51fe21087bae2944a0a85dbf51dcfcd4cb16d4553bb2d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 10360 bytes

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