Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c425fb87dd6b6f3…

MALICIOUS

PDF

88.6 KB Created: 2021-07-31 23:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5f5076d6df63fca04fabee0deb3b76ee SHA-1: e776b2e508747e787b899504f64c234291768a59 SHA-256: 6c425fb87dd6b6f311c47e88ce55105ef625d735bf2c17ba2d3414a4dba3e79e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://chcial.ru/uplcv?utm_term=how+to+reset+uniden+answering+machine PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4b426d539---bopugosere.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/lazazosur.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/kejexixoxinodolu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e94b87c---99976207363.pdfIn PDF document text
    • http://unseretochter.com/images/file/5966750331.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e945ad0114904e4f67d4b5f6027a76c0/jibagezedaz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1fc4fe8---visixupufebatavuwe.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080980e3f75f---dabiratalekebatu.pdfIn PDF document text
    • https://digireg.at/upload/56258550574.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/wamojisufarusijaj.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/3492896930.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d799fa59949---40012058338.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gq983gclngh6ouai3evc4qhg32/52288650100.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607230532431b---527078421.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/a32b5779f5dc0e70c87a3a4502619386/74741538616.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pokiwutivusogefabanune.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753436c28bd---gamudojigujit.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be4d3e717---fumuzetuvosazogofa.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/466ffb6f9d960379ac4f99d99355b64c/14539928570.pdfIn PDF document text
    • https://parkettworld.com/upload/files/lifenuluzubituvewetitorix.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/dazufudodipebatubure.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_01_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 10948 bytes
SHA-256: 5b0980d0dda37bc980a2a88d19502f255571f15c95ee31e327d8ba73df72c6af
font_02_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 16892 bytes
SHA-256: efc3d12c45e773a6ac5fc4b08220ed0c651b3001fae567ac55e5927ab46fa6af
font_03_sfnt_off00013b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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