Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33c3ab65112f56…

MALICIOUS

PDF

70.6 KB Created: 2021-06-01 15:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f32e7964d1a8ec8658bc823b99eb92f4 SHA-1: 72ece4621d179629f9c41e9fe96e432a23acc2e5 SHA-256: ab33c3ab65112f56f9ad4cc4d0b9a040835f93fcd710d59563a9b1d343e2d623
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm to distribute further malicious content. The document body, though heavily obfuscated, appears to be related to test answers, a common lure for phishing campaigns.

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://coretry.ru/uplcv?utm_term=fema+is-100.b+test+answers
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/97675b81480adc2701d96342150d1f04/gorevevekumogusudov.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6790b3db512c129bcc8a9c2894216a87/61688372492.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/bd97879cj0vbs1ot4tph5b3sgt/29158947112.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/965cc284c27b114341ec22182fd19485/28011287348.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/omvtr6cacjndp237i9789o32mm/15345078127.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34751a0305---7495949008.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160926156a6ae0---50470211302.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bc5ff0dd3---vixalajevodalub.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dc9730600c07e1f251f615aac801f38/bolugavesela.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6ca09fa55---texenaxukedeputijopod.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/0ge48d7bg8tavc67je8nus0qp1/nuxep.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5ba617fe---disetelajujoreromalelu.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b046c333c3f---lepetu.pdf
    • https://accuratesearch.com/userfiles/file/sinatejek.pdf
    • https://alutat.com/data/file/revizagogub.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/59356124685a00ca1970fbe7874e1f71/bozibade.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083331b29816---xajifitob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d882.bin
240cbc83d9cef6bd082a61939b413a2fd8829010196ba41cdc9759d3a9750cc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 5244 bytes
font_01_sfnt_off0000ea5f.bin
9e005a501342ab9ed7d440336ab6a76ac8cd04817580b4748ca2bb93124a8034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10280 bytes

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