Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b07f2150898e4c…

MALICIOUS

PDF

87.6 KB Created: 2021-07-19 16:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 76ca1732c61db0fbfd414fdf8a35f666 SHA-1: a6763155e32813708b0887f2f869b989997b9a27 SHA-256: 73b07f2150898e4c371624eda7727f2c07acd3466e6fbc9734214aa27d1426bb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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
  • 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://baoyi-chuck.com/ckfinder/userfiles/files/dibogosugulusozagabunepil.pdf In PDF document text
    • http://nadiadsa.org/userfiles/file/rowotawi.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/83509630447.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/623892e2f41591fa0535b3c9ad970ba2/xorasepepogo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d8862ac9---fatuxekirajiramuz.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/65352094652.pdfIn PDF document text
    • http://agro-partner.com/Image/files/xuxolif.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5e08880c---57544215775.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087852616861---fumisusiwopugiv.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/vuwepekurisiwagawigu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5dd3789d72022dd5a6aac6523cc9a53/60616544550.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093add8555e1---53888080723.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/91101923913.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/62a8d6da42d5d391805d14620118c2bc/4280998753.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f707f90715---83411201292.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6833fbf7b9---96022857802.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/17226618310.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/1e09925a008c156bd8379afe8cee9b8a/wawavesokasej.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/dujonifagobuzunatolaruxo.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8c4a2815e4a3015d17675658efca5542/35686104820.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be35498595c---vagosadobipuvowizukas.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/duzezuvimawafuxefad.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/48c3d6ca04d83d9d9d98daeb879952da/66379681298.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160801fbde9594---sebivumimusowarat.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aebd576cc---nafimebokesikagujofagiduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+fire+red+guidePDF 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_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10416 bytes
SHA-256: 39b0ead7adb7e3bd87b22ebd741fd4039a5c5fa55b64c67e29e3eb701114f2ce
font_01_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 17104 bytes
SHA-256: c2fc9627ffcf9bae2cfeb22373dc85f5adaa873537ab5296fa18a2de1922ec53
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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