Malicious PDF — malware analysis report

Static analysis result for SHA-256 6698cf1ad015fd36…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 09:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b77cbd9c61fdab0c4753e77f5ca7d09 SHA-1: 22a066f1316a8015b567cc7c49c2b50796f0c2d5 SHA-256: 6698cf1ad015fd36a21c4a2c0c6c3e7ac8f467ff61053a7b3455b7ed3f5e2178
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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
  • 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://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0274489a---taxop.pdf
    • https://fortworthdental.net/cmsCart/upload/file/tapabalowuziwu.pdf
    • http://cwesp.biz/upload/file/tiwonevipuwe.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/49593904143.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/331be293f9f19238f66249b8eb697b8e/56770877550.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5b851726a3543823188518b77380bf20/dovutidaluxujidu.pdf
    • http://www.sm.ac.th/ckfinder/userfiles/files/mowudemoxanikid.pdf
    • http://thanhnhomdinhhinh.net/uploads/files/13672147463.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc13d06df8---sigimaba.pdf
    • http://wo-kop.pl/userfiles/file/29183774874.pdf
    • https://egyptsuntours.com/userfiles/files/80272814138.pdf
    • https://argekaucuk.com/nbg/upload/files/64047549697.pdf
    • https://akilanews.com/ckfinder/userfiles/files/mepize.pdf
    • http://vxclouds.com/userfiles/file/19008989078.pdf
    • http://appartenvue.net/appart/upload/images/xopeb.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0gs1k5klsrlgefgtcjtn0e8880/minubataxesijoraxo.pdf
    • http://musiclivemarsala.com/userfiles/files/tomamedopigajemad.pdf
    • http://tvoirostov.ru/ckfinder/userfiles/files/961615033.pdf
    • http://ovodatar.hu/userfiles/file/gaxal.pdf
    • https://rumputhijau.com/contents/files/63038684883.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beff1e9a263---xejefabilud.pdf
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/91284303546.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o03blrcf082quk4m9e6rks44up/47202840408.pdf
    • https://krusomying.com/data/file/49546503135.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=junghans+max+bill+manual+wind
    • 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_off0000c2df.bin
d9535702946bde1aa74b562c9d1621e42700b58cf02cebc35069a74f6eea7567
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DF 10664 bytes
font_01_sfnt_off0000dae4.bin
53e02af809660373965e72e2ee15c1bb143ee87d002d84c9bcc75bc8effbfd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 18428 bytes
font_02_sfnt_off00010afa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFA 16792 bytes