Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97defcbe5a7583a…

MALICIOUS

PDF

87.2 KB Created: 2021-08-10 16:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10f3b091d1c3f293a8bb60d0fb317911 SHA-1: 214613844e621b7274206e19108aacf8d68999aa SHA-256: a97defcbe5a7583a205dd86d64d5130d37195224cf590c68d12e3b2f3441ddf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely to lure users into downloading malware. The embedded URLs, such as the one referencing 'roblox executor download mobile', suggest a social engineering tactic to trick users into executing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://mosallaesf.ir/uploads/ck/files/7759242002.pdf In PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e946771a3af---15662309155.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/29808829658.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/85252e68b0b2bbf4172aa0fdef186906/raramuk.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608924a6223c9---96368394942.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/aa7293762fd8282a10e124ab8dd51656/wewefalapuzezore.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e64493dab---13705868148.pdfIn PDF document text
    • http://nic-irq.com/userfiles/files/bememefuzunitabe.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/73943264178.pdfIn PDF document text
    • https://kumsalgame.com/calisma2/files/uploads/64666265169.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/71395368277.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vopomutoniragerijone.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/80667250326.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/68d492c88ca31296c8ee9b239816f9ee/miwun.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/29097737860.pdfIn PDF document text
    • https://datajournonepal.org/files/piwigibenote.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/22935950319.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/raditiremelebawegusewe.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/18318429797.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820171c040e---ropazoxibidejufanuwopar.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/jexavufonosolilekuwudi.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/besupegifuzuk.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/xepawaninegipidaxusa.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae167acb9---bopiwajikidimosaz.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608848eb1598f---2341015111.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/95581995160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=roblox+executor+download+mobilePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d4f6a1b95---70997310929.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 16028 bytes
SHA-256: fe32a863fa2316fc7d681864f4f4e4c0b14c688cdf550a69ea94793f63ab963d
font_01_sfnt_off00011d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D96 10836 bytes
SHA-256: e147fb757397521de11affc0a5f8452bbd039280b1d8fbb1a789208d39c238b6
font_02_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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