Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d616f796387e9b…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 08:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af2d9da55a4a5c5ce539f46fb60cb114 SHA-1: d27e26601927f889f4208d3c726987e03752bc7c SHA-256: 06d616f796387e9b50bda33f262aaa1fb0caf1981debd52b4cc8cd6f12bac979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to the 'Pdf.Phishing.Trojan' signature. While no scripts were explicitly extracted, the presence of external URIs and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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 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 https://wastran.ru/uplcv?utm_term=2020+irs+form+1040+schedule+e PDF link annotation
    • http://volamtuyetthe.com/userfiles/file/valimabajolomuwepija.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/39943404318.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/28003901000.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/58e80ed487ed1511224545111b3f230d/zifofe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab671a1c0---97317795060.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/39855473527.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/46438530639.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/2f982e91ecc08ecfd08e015fb45a058e/zujebojozolafuruxito.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bc2803727---duwibazumados.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/dosaxupigafetazokirivila.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/gonusuvovutuzufune.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/vagunej.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/denagikemebuluvuborar.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/acc7e4e8f08d9d3bc8a7f75622c9329c/16604715268.pdfIn PDF document text
    • https://blugarden.eu/file/fawonilozobajali.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bodovesuwakeramov.pdfIn PDF document text
    • https://datawire.gr/files/files/xidawekawexibuv.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16109bb30f3cb6---17053453196.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b19e90b2675---nugalalizasim.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/litaranuke.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210816211440.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3f9fd9715---2045799727.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/28860646993.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/93775176869.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/41113213987.pdfIn PDF document text
    • 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_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF2 10752 bytes
SHA-256: 82afc4ab26f4f11913d8a4b7d5b69dbe44ddc930d7b87b82af21d4dabfd1e99c
font_02_sfnt_off000115b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B7 17940 bytes
SHA-256: 1031f6bfb68a9939f3f0a40e784bf8b62fe945274da32a5a5447a80a856fc6cc