Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ff3d18d5573340…

MALICIOUS

PDF

84.7 KB Created: 2021-08-05 08:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1b57b9ea7f203b7c4ac1cae1a600ddd2 SHA-1: 5346f81091bba8e40d036429ad17a1b9fab8fa87 SHA-256: 18ff3d18d5573340a270031121978f4467c1dcd312a9c856123b0bfd5933eca7
216 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. The 'Callback phishing phone lure' heuristic further suggests a social engineering attempt, likely to trick users into downloading a malicious payload disguised as an archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://clinicscrm.com/img/files/7678859309.pdf In PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7q7mp03sq4ip3dsi7m111fptn2/vopamuloserimonabivowulud.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/88520641366.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6072ae3c6---beremidugalunovexo.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2c8886059a15be39beb58973d6f25616/96129153034.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/jewuvasu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866de96e119---36830119126.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/c61445b623f2201197f3368af737678f/xazokotunibolo.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e552e4c359---21898155245.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xixijugetupisigebipese.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/o694mqeepumkhfj06g4bbomm8s/lojigubima.pdfIn PDF document text
    • http://ashioke.com/images/library/File/kixeraxenuputa.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/oa026jvm029cadpiegkood9bl4/96293415038.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4cfb10f0---ramijerixinawafosisamu.pdfIn PDF document text
    • http://boyanbolyarski.com/userfiles/file/46591965954.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/kbe3voj5mm5to597vjrqv263e4/virix.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/46602974396.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7983e1ac6---66564440103.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/74360183936.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602120327.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xulanesusuz.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/80060982809.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/fonepulopefifonoxojuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cs+xtreme+v6+torrentle+indirPDF 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_off0000e4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10616 bytes
SHA-256: b0caa7f6dd47c0c17c5faff34b65b2bec83a9dbf36251e69d09fcc6996cacc6d
font_02_sfnt_off00011560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 18856 bytes
SHA-256: 77cf8126e9489fa7e4dfcdcfec333d687ce4ecf369f02b73e46cfc3faee0995f

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