Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dd1380be7eebae…

MALICIOUS

PDF

67.9 KB Created: 2021-05-17 00:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 8aaec1d933db566fdbbed07287c9679b SHA-1: edd27dfb68af7a9b4388e30e648ec38f7b8c7ce7 SHA-256: 50dd1380be7eebae082421487660b78ad060fef3fcfa9ee59700319de38f4757
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8965

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=acrylic+sheet+thickness PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609870660e5d0---lesugiderijodutagepepo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077136863ea6---wipojolorumulujisedefede.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9b07a42d70cc47de4c9645dcc46abc5d/59407458128.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5548018678e811851f108d96350911ac/xokonojofofevalufopasu.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4cb6759ea9883351df472ff25ddbfbe1/dugonowumojulusa.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070eecd976c3---90434137763.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5f66c9704266ccd3ec104d41d82a285a/72567556153.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105121006.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160781a4625ffb---86458297962.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab340f5f7---zoguxevinuwofog.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7f5316317413a7305a4652e3e99ffefb/41224892988.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/e31a079993eb4b67e95f65e6da5c5096/17669752216.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/ka4vns0v19p6tc7l0pfrfdvvi2/bigusiguxotovolujamovazog.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff9fd3d69---sorevipamiraris.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8550bf66fee3cd9d821dec03b3aba191/xijowimofageforuvijinegus.pdfIn PDF document text
    • https://actor-conseil.com/files/file/mobubudodaf.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65630619e---8205534496.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea48ae2aa4---duwegiji.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/lekedikorovabejupajuzimog.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 4832 bytes
SHA-256: 31b17e22a6c7ab684bf524e09d1de8b7a3d4e3d5be2619fa4fc7612d1d59d062
font_01_sfnt_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 10108 bytes
SHA-256: 7c5eaf9b3907acaba0848ea706d9e5bc89ba1e8edabcf2e4862fc0107c708b4a

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