Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e5379108e3b77…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 23:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 97795910a7f23049207da6df58216862 SHA-1: adc82565defb42492b5ca0d0009ec967ada9c813 SHA-256: 1c3e5379108e3b77b954c5b41e6fc12e7c111f70cd578083e0fbf082a89e70f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's primary function appears to be redirecting users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=the+camel+spider PDF link annotation
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948de367fd9---59547969488.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/molabedasunamogosi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c01f1d79---53168089663.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638dcbe063---25323666744.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/u6krnsrj06v6qfpel79h99tsp3/xojilezi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/be7b911b4defbdcb403ece06f499b053/81834544630.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qtphais2ko3f7gdrq8reug5aj3/7998335528.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e306bb2aff---50986517918.pdfIn PDF document text
    • http://aweibel.com/Photo/file/27906224596.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/5717229477.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rivukezezoridus.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/qc2nlcgpi5mg8bif6i2ur9d9s2/55140315300.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ea153573---pitovogafivawisorag.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/86tn0345stutkfbqakf24s0cl6/birewoxajufixabegubikobo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/28505444756.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/784204117.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/mosudiwufipax.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/fd87f543a4e1a14ab560fa3da7480959/lepetiromej.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/34f577f7c58f24cd998823dd09775f29/fimimewevafarulojupoza.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6fcb8b1659---60794615942.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8e460b17d95fe25bddae0a8002d9e20a/20723195955.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0d2d528cf60b1dbcb43864b9e01929e4/jazor.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/bevik.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 16736 bytes
SHA-256: 393c24a87c659c689ed4214ab16fbc8cd5fa2d3bb06a86acf955e775642adae3
font_01_sfnt_off00012233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12233 10420 bytes
SHA-256: bc82db989e9b37881c790020a9c3aed72e2c9251121642b68887fbe9aeac7b41
font_02_sfnt_off000139bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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