Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3dff6afaf53c61…

MALICIOUS

PDF

73.4 KB Created: 2021-09-14 18:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9aefa665f21bdb3575e3bd88b756a7f4 SHA-1: 91fe033bcee46e9b89adb7f71824da2429dd2594 SHA-256: 7e3dff6afaf53c61e651f2d49defe3ef3d66309e37fe63fbf1b6ab83fef6e4b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://cauthangdep24h.com/upload/files/tabepagavowomenadoti.pdf In PDF document text
    • http://cafesezony.ru/fck_editor_files/files/49917489586.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/gexokek.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a2160daf3fa2b5f501d9ea44ac4fc0da/26085911413.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3767c372d57e9ce93a4c769e50400f63/36842177703.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/47224027146.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/69567388694.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kirevowopaxobotajokisatun.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/7760354489.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/43388145859.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/gexufaxit.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161345da01fbd3---tabonaz.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/30338703049.pdfIn PDF document text
    • https://maviet.vn/upload/files/taxilekozuxaxup.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c0ebef11d7a91126a8ed21a64e0334a0/62358398292.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/9499523537.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/zuxudago.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/63ee3e72f281c0fc806274d4e06f35bd/20913098578.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j4jkjm23uc9rirmog7cacugso1/muwawomanesugulana.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/timejagul.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/dosemalexusojifire.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/zesivizokogusovomexokexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=signal+spirit+communication+apk+freePDF 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_off0000b92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13E 17316 bytes
SHA-256: 7c9ad80cc65a85b3f8d546d9bae98b4b67eed87af9277b1096c59d8092384a2c
font_02_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 11088 bytes
SHA-256: 6c3e87f075c08c1b5f7d5e65906042d3d93886f23a85c7bb765ecf32c2bb45b9

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