Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61c6f04fb635822…

MALICIOUS

PDF

95.7 KB Created: 2021-06-17 19:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 96198995982a735713973d40592fb66c SHA-1: 92db4a12a40c415f7afda3e218c90fac6737315a SHA-256: d61c6f04fb635822745ac1c95a354e3a87794d8a58aa13f0435dc9354cc5f7dd
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous URLs pointing to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The document body, though truncated, suggests a lure related to 'merchant of venice act 2 scene 5 workbook answers', aiming to trick users into downloading the embedded or linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=merchant+of+venice+act+2+scene+5+workbook+answers PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6naiho9rilq1nv4u4dnhrol4li/ponowok.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/h7qbirr3f5qud2g14ecrkuc8j3/75924853054.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f5e6fed5c16801881f279424f4358e52/vewimutefamola.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/fewumabatofabenaxanoledor.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb39f01c99---13930014396.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16075322e20f75---84677778338.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/58788098298.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4699cdf69---24458701024.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07b6261e28---wunugijuxadonanixopirabok.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/39430002873.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee3b7af935---60156086762.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c91195c6---tolosuvadizole.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/d942b5445c11df722d6bccd48aadbbdf/pimibudojikomikeruruwuza.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47299761667.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c65857d0---fegofatetufu.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/43979196638.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160792d3ab40fc---fenotatuxu.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6235522e71f0bbcb986ab182ace28d91/zusisedo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76c52ddf0b---danuvusosijexawefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 5556 bytes
SHA-256: cb92031a63f08225c445d4e3af90a939a17e6d34de5e46ac4c21548c0a4a5717
font_01_sfnt_off00014933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14933 11228 bytes
SHA-256: faaa9e6ce381203f97464926fe9c1fa52f616134c00b8e8e7728fa588f5fa814

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