Malicious PDF — malware analysis report

Static analysis result for SHA-256 5187e02095c8b9f7…

MALICIOUS

PDF

89.3 KB Created: 2021-06-11 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0966cc7fffaaef69bc1fd19d77634441 SHA-1: 58477cc5dcb4199d5b69e0ba27e368f5752d4952 SHA-256: 5187e02095c8b9f7880f9a2d230bf1a4b912bef3366ea64cee26ab4ab7824a87
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=gunpowder+materia+medica PDF link annotation
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082390882226---koruzotejulu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f81b76f676e93ce253a6d30db5b5b2c3/xonelutewas.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/39155985373.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074055445873---57623763711.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/d5itpafmaiitptfhed0co909k8/gijituxiduvejor.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b35367192---37468333238.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/25784912402.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/xopagukatigef.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/60350857158.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/vaxuwetodejipur.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/tifefosigob.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078710d68c89---fexexinepox.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080e68383f83---sewatilidetosirefuzev.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/xerorubufifatogojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 5016 bytes
SHA-256: a31a5c0df609bc77adf06fb195a40b2206261625c8bf6ec2e41e3cd2298eb3bc
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 14684 bytes
SHA-256: 6ecd0d5a4630c24041775317d3842d8c3785a92cec88963b35ffd0e85c2c6879
font_02_sfnt_off000133e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E8 16496 bytes
SHA-256: 5e89d274af516f5503173932d1aca6c3bf84f32de3c489cad423d2c2220161d5
font_03_sfnt_off00014a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8F 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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