Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb55ca850a1b907…

MALICIOUS

PDF

69.5 KB Created: 2021-06-23 16:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0a7790237b5ba11e3d898292c26dfa35 SHA-1: 0d989e94cbb785503060c0f436971a765bd45410 SHA-256: 7bb55ca850a1b9072a61ad510495860f879bf2ef5170a2cf15fbe14b9f91003b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is part of a phishing or malware distribution campaign, likely using spearphishing as an initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://laborke.ru/uplcv?utm_term=lifebook+s7110+service+manual PDF link annotation
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092792452c75---1972537450.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325eee34b---45241882066.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c931391da78---252156660.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/dmi1r7q9larrf1vof8m9eaitvs/lusuretifinegowere.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a24b818a12ecf371826acf7398bad9b/83765062901.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7084f33e36909f969c148feadb772fc1/rerex.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9fcdad830---52271993591.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/lesuxumepuvenexufimizeval.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/46316770195.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210530131013.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/83694926219.pdfIn PDF document text
    • http://www.asslar.de/downloads/89197628386.pdfIn PDF document text
    • http://fittbike.hu/files/file/maverapenubipotosaga.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/41775487570.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/7bri41k6l1vk2fmiqju77qabm7/wazuvoziruz.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/eektbhoe5i5hqtpu8qs2sdaro1/83324341312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 5504 bytes
SHA-256: f687f4a64fb64fe1a06b8b457325c3322840b664b1d35f7d414413636a8719b5

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