Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c8f449faf62259…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6714aab4e8d1637b52e9ca392a10a6c0 SHA-1: 210889218ebc92cf8ca511f0d82df0b1a6d33803 SHA-256: b6c8f449faf62259d55337127d229c8418a06d6c9efce8050f42bce9b75de69a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised or disposable hosting sites, consistent with phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic suggests a pretext for user interaction, such as a fake billing or refund issue, to encourage clicking on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://master-sign.ru/ckfinder/userfiles/files/gazezob.pdf In PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/44527089129.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/71798404480.pdfIn PDF document text
    • http://wmasgroup.com/userfiles/file/sinitivozusidujeledawo.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/dafememogitedabopuvagena.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/91091962826.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144890f2f106---gosefegopis.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gifexevewepuwisikute.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/57169837447.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/56384478902.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/44736155320.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/kiminiduxina.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132db6860f01---96351574839.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/ronabira.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7381a4aada23dea104c87b267e05f276/venuwisuwupatamominusixo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/91599538472.pdfIn PDF document text
    • https://podimercrm.com/img/files/36598055703.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614045cee2f75---nuzezurasexobafofi.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/55680741834.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/pusamo.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/mugujidil.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kuvupevunomu.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/30896998277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+remove+hotmail+account+from+android+phonePDF 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_off0000b0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EA 16656 bytes
SHA-256: af753e8ab53834a0b0daf5bf604a1588bf552143ff3a4bfb1b7f42a7f3a473be
font_02_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10960 bytes
SHA-256: 27f6a703aa626191a4782a3c3fd6f7c3d2cc9e1a80335b8f9e3c32e42663744b

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