Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d56a25f8992711c…

MALICIOUS

PDF

70.1 KB Created: 2021-06-05 13:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88b41bb154a12d465ea562a3973d943f SHA-1: 95da166915060687c8e56b9ae7fba71a8a10a8fb SHA-256: 6d56a25f8992711c130403c1e75c0dc45aed5e755dcbc852df96f02d46711966
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the phishing lure.

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://ketchas.ru/uplcv?utm_term=harry+potter+google+drive+mp4
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/eb8d8db2a9791c64463848309ea36f73/49688719445.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16085186be547c---juvegufivese.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608533c1d5d81---40314890480.pdf
    • http://101-games.ru/images/uploads/files/68494584418.pdf
    • https://afayl.com/userfiles/file/sabivawuvapi.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608360fd76980---39634879553.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/6e88s6g3lnvk7idqjhr12er11j/94129820032.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/61393800408.pdf
    • http://apexibd.com/uploads/fck_uploads/file/gebugidetuzifobomogulek.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a9426bc6578---lulinegotidepabudoj.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/3pg81ib6aoh949orctgrpsqm15/22746841587.pdf
    • http://avsa.org/sites/default/files/images/files/6403555597.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n12m6kun6v89c5j12e48pghqo1/5646027075.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8e15aa65f3532474aefd911ef3a98033/sixiferamevorovuvas.pdf
    • http://ankurgroups.com/userfiles/file/87344012417.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/584facce8524fd8bbfc09272c7b861e1/19590736488.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0ef37d3fd---wutinozorureb.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_off0000d3de.bin
84abfc75a99e0a65ad427ecda4c538ac4fc9e0e5737398cd73b0e4983c6f1375		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 5312 bytes
font_01_sfnt_off0000e5ef.bin
cf83d265b27039eaf51c5fefe702c23d574d7480eb1313c800b3c66f3bb8fad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 11060 bytes

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