Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fbe04cd8790c85…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e67b429579cf0b4171abf7ca641b927 SHA-1: 8ca0be64def23733158148aa4a69019cf32908a2 SHA-256: 41fbe04cd8790c8529d481eebfddd76996429cc376a177a44f26ce5a2991d0ae
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to host malicious content. The presence of heuristics indicating urgency and invoice lures, combined with the sheer volume of embedded URLs, strongly suggests this document is intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 9

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://archism.ru/uplcv?utm_term=footprints+without+feet+text+pdf
    • http://aircond.md/upload_fck/file/zedebolotuxenu.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608216660a227---kudoxurenumazu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ecd38542---32824872489.pdf
    • http://artpolinakuzina.ru/pict/file/36265173656.pdf
    • http://joyear.com/ckfinder/userfiles/files/meroxe.pdf
    • http://homelife-superstars.com/image/files/mofolunalogazixipoja.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752e2694b01---siluzuluvoroxo.pdf
    • http://flagrant-desir.com/userfiles/file/winibelapagax.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ck8pqel2ne1o9h2t91qn37je4e/21984932387.pdf
    • https://marcuspietrek.de/MARCUS/files/file/23119685907.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4089319bc---wufovelidar.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bhva0os7l2quotu4h8flf5th3/90579480437.pdf
    • http://atsrealtyvietnam.com/upload/files/saxajagali.pdf
    • https://arch.ua/ckfinder/userfiles/files/bukuraw.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120719d0fa6e---xidujulepuweforivujako.pdf
    • http://archifolder.com/userfiles/files/34097182254.pdf
    • https://debcopharma.com/userfiles/file/241333836.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210626_1E333143768A3183.pdf
    • http://esthebel.de/userfiles/file/56728903877.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/39842e9202427c3b4eacc0ebcb7d4de9/kexosewi.pdf
    • http://atdawnwelift.com/userfiles/file/4080965213.pdf
    • https://dolaodong.com/userfiles/file/92043024171.pdf
    • https://avigailpekelman.com/sites/default/files/file/kotin.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dq1r4kkvkaj0oraepmjp6f2pgc/55185941129.pdf
    • http://tingchucontrol.com/Uploadfiles/files/laguladibepazan.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/gilobitamivukulesix.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin
d90bf2e9d75d832b5e41aa81d3883251456dcafc7fdb599455fd5c88d7939fca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 18584 bytes
font_01_sfnt_off000111a7.bin
e8b6fb55bfb868d363e269a3e66d0bebd46b2bb9f73cfbe247a0fe9140e641fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 10652 bytes
font_02_sfnt_off00012a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.