Malicious PDF — malware analysis report

Static analysis result for SHA-256 3541ff739146065e…

MALICIOUS

PDF

71.4 KB Created: 2021-06-20 12:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6891876b3585de9ba5a42ccd25d7a1d5 SHA-1: 154980bc18f0659b00d48cfd6a44de919d5b7b6a SHA-256: 3541ff739146065e255c675a970c481e3bf562dbaed1bd4e83d53835ff5b3d63
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains a title related to a reading plan, likely a pretext for the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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 https://infrive.ru/uplcv?utm_term=new+testament+chronological+reading+plan PDF link annotation
    • http://bjbtrh.com/files/pic/file/xutemevevaxonulolapufi.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/65946170075.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/gosepelopuf.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074981e5301b---4178838207.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503347a388---26772127625.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b09c990b1---59289890574.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/3680569755.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/fe0f2d17e90cd1c4ffc0ebe4ebf61d69/zemopuw.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/pefuwalazasa.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/41016169238.pdfIn PDF document text
    • http://short-story.ru/upload/file/53693135054.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8dad0bf49---volebiribivilufurepivev.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1570563841607b7964fe9cdf643e5e98/97462010780.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/478ab784496596be5f90327493026b8c/48414296364.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1126cb609---tigizirilekorajuvejoguve.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/84443997581.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/bobumowononefu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cfb5eb25---dimopuxume.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5548 bytes
SHA-256: decfc9d080926166e45fae610f502b4f55e5d0d3d72d4f8d640882fed1793458
font_01_sfnt_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 10876 bytes
SHA-256: 65ec6d9e46ff38636b50de57dfa45854e9783d69caedaa6159cb9c947c1c1338

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