Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c6fa1197830eb6…

MALICIOUS

PDF

97.1 KB Created: 2021-06-29 01:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65e19ed68599e974e1319e303af9f382 SHA-1: 642e289e53bce86c5f54c244e44cf8cf08e2e74b SHA-256: 77c6fa1197830eb65522294945c0d04f0d9d8cdeea0db1078ddc3c8b6ab03631
196 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 CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of external links points to a likely spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://amursvoidom.ru/media/files/manipepeg.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d192154666---fulidawofapenetofitewu.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/geve0imr6dbi5jqnhq61dgj562/54730823946.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aff52d0fde3---77580911442.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/a807ffa2c73da1f6dd74bcfd041564b0/23123788870.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/630286501d440366ba2303dc9268a057/23988131859.pdf
    • http://scro.ru/pic/file/85922890981.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a374c0d1e9---luzedade.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af66455cc25d8f5affa94813be4b4b9b/noxemiwabodif.pdf
    • http://fygl.net/uploads/file/220325487051.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/o1pi7ov58ni4qi917o6bugan4g/47597073885.pdf
    • http://jfhconsultancy.nl/userfiles/files/60906066460.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098611274112---pezug.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b1de5bd33cf13389062aba39704342e6/vojazumekuxadiwapemit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60533a53c2---dozixipaje.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9485269072fb0acf004f3680fa460ebe/85668772615.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8e49ddb3f311cd85795e14e4e48befa3/sinasokawub.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070c42e376b2---37534860989.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdf
    • http://esistore.be/userfiles/file/47704574190.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/raxakakub.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff517adbe3b4ba47e411d290f72ff492/32210389171.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a7544d25bba469d1cb41d1b42d3a84d7/3933499625.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9fb298e76dbfbfb394945075544f6045/fexunuvifizomelutifasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=personal+growth+development
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011886.bin
3e926e0a538eb6b720b9f5c8cccfefc2e44fdd6614800231f2939145ccb6f271
pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 10900 bytes
font_01_sfnt_off00013178.bin
c4b0042ad32d943e06336c37fc80ea205022a471c924ec6eb70243eaa0bb4bdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x13178 17532 bytes
font_02_sfnt_off00015f23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F23 16792 bytes