Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe28a02f36d95bb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 05:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4381ca184d26829c53faf6799cd3e69d SHA-1: cce20ae1187f6d9bc63434daae786ea5c0d20c57 SHA-256: 4fe28a02f36d95bb1331afc3d47ed5449572661b858fa9612140dd9c848cca33
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=biohazard+2+game+free+download+for+android PDF link annotation
    • http://restaurant-lyons.fr/userfiles/file/89103632961.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/judojegedezevedetutemek.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/51380313642.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pamipazadateruko.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6dc7f3f5---nekimexoruru.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/87484616663.pdfIn PDF document text
    • http://tfforming.ru/d/files/lorenapudugedizo.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/rolefabibapinelumonaxoj.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916233033.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/mozawadufuserededilaxa.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/3193947544.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/use2sacvhk8smva9l014246rdc/kopene.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bd580a6---80868183730.pdfIn PDF document text
    • http://gibisch.com/files/files/41072329587.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/47627834762.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/74455135128.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff4c9b97a7---36399543792.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/nudozutobafu.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/15744592725.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51965519269.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210913114527592639.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17572 bytes
SHA-256: da57a22339d7686fc812982f6e9cae570ade1071f067a751309e5bd3b5b1fc8e
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 10856 bytes
SHA-256: c0c6d0f04d89c80b9e2081a62bb68b93f2d448433fad522701c55605cd37aa82

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