Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e4421f847b3a1f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 22:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f55220ccaea72ab55ecc8989f204e707 SHA-1: 63a1c82981b50b83ef6dec0c1ce8ec4435e5eb8d SHA-256: b6e4421f847b3a1f4a7be08badde86618968b63b99c768043870fa835cccbfea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF is part of a link farm designed to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=beyond+manga+apk PDF link annotation
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/kifefonulobovadukuweret.pdfIn PDF document text
    • http://ge-mak.com/files/vobisoxotozugam.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/ritabikifujazufupufokox.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/geberamilexabe.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/tipizizarova.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/sidizafelasipe.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/zixufuwinalivipikajukuw.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/xawor.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f213ca7331---44233609791.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/94049066847.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2087963d7bdfc1a3326d9b718ff00516/boduvun.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/081230251625.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/8cc2cbd291d88c87c03259f65cc9bae9/refedororiz.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/xomifekademawuw.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/97188702502.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/7769658063.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/jipubufakubijirotos.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/36184561866.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0784573af---wufopu.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/kerafipavemejorilekamimex.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/salunimojiwefigagomemota.pdfIn PDF document text
    • https://onlinendttraining.net/files/doputeku.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/fepawidufikudolodikir.pdfIn 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://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_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10488 bytes
SHA-256: 498f4ad07f7d00ff3a7e8f17fed0f8de4904bc2817f11d9a6d36769f3eabe96f
font_02_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 20100 bytes
SHA-256: c844d3eb77a1184d1fc300de69a545bab076682f8383c32851b8bd9abd8aa3ce

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