Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fb8e67786866f5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 01:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5e1a51aab6f7cda2802b3c95052db4cb SHA-1: 6abed1f0336dc50c51e5926be5865e7a5e753664 SHA-256: 25fb8e67786866f5ed76174b83cce0033be9a1312d96ac232cfd1adb1723038f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'download button' lure and a callback phishing pretext further indicates a malicious intent to trick users into downloading further malware or engaging with a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=god+of+war+ragnarok+download+for+android PDF link annotation
    • http://alde-pace.org/ckfinder/userfiles/files/14006497354.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vuxidamuxugugapoka.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/44967892991.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/65676132411.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/xupujafudiwemewu.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/98610839380.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/bupavufudidamunigawonoz.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/lotarosobulidukumulu.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24295980819.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/84477340063.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/16142490936.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/466e7fb91d525ad81fa49bb1abdf58a6/lafadolajuzitolij.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143144e4717c---vugef.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/51738040510.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/voxupunisazuka.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/51327329221.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/25892494034.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/2439171302.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/47dfa296cdbf93e7989f6a3d9ff772ad/47027899170.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/s3nchbsv02emvu93738ro1vst9/98998289099.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/tivisutoxegitimebori.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/dijabofimetegekelave.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_off0000d8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B1 18168 bytes
SHA-256: 3d2b69312e7c48128ee411cadf8a9a976b7a033bab7920bd4a2b179a74409c16
font_01_sfnt_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 10348 bytes
SHA-256: e2367acfb06881e70638452d33237a23514fbc01ead768ef926127fdab6e58ee
font_02_sfnt_off00011f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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