Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b5de2ffedca3ce…

MALICIOUS

PDF

93.6 KB Created: 2021-09-14 13:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddb8ea890178fa9aed44e6322d55adca SHA-1: b0e0309163f26b48faab340ec988672c89c23e99 SHA-256: 93b5de2ffedca3ce0f7b4c1a359b6a7b80cc172f8129dc588d1670988896cb3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms or compromised content management systems. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO abuse. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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 http://laskod.hu/userfiles/file/zitelinezunogikiw.pdf In PDF document text
    • http://avanti.pl/userfiles/file/42685406417.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/vikofeneg.pdfIn PDF document text
    • http://ombs.ru/uploads/files/rarabujareruxa.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/senaxifezuremevo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da922bd8d6---44552026252.pdfIn PDF document text
    • http://metall-press.ru/files/gudefovomulefadurura.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/80526348029.pdfIn PDF document text
    • http://josquin-capella.de/download/gobubajozoxasukefesimofaz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130179890fe4---32667801577.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/xigexazise.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/35422332699.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/torafupafarexifimar.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb5eb90ed---sumasij.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/13492650731.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3031bd45---20273962140.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/81653034125.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee74508992---kogotumudajotanob.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/radorifikanoju.pdfIn PDF document text
    • http://vannordenvastgoed.nl/userfiles/file/51728837017.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/24123595812.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/monumoroduleso.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/48b02aae9dfd6c1b0cf38a7a5d6f42af/68309420122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=edit+pdf+using+photoshopPDF 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_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 18436 bytes
SHA-256: 8f5027e3a46d2053e0e3ef111da98ad06ee8e196ed7f7759c28eed26fa2cc9ee
font_01_sfnt_off0001396f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396F 10420 bytes
SHA-256: bec714156cea7b75ada35a66dcad1ddc6db6f5172b5c2860be6b41149dd8acc5
font_02_sfnt_off000150bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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