Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a05b40b23d6f8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 00:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b1a9dc201e56156d561eb823f6c185e SHA-1: 0a8e20a42c08974a401a31997f26e6eb3847a98b SHA-256: d84a05b40b23d6f8ec69d9c96472b4333e096386b10f81b4b6cb07b742adffd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=the+renal+threshold+for+glucose+is PDF link annotation
    • http://mabo-meccanica.eu/userfiles/files/75214465466.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/93519166313.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/wuzozaserasokavox.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/358b7227ab05e9b14b4a3a7425bb3d61/wegifuvaletesur.pdfIn PDF document text
    • http://healthywithhart.com/res/file/35314703992.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gerejuvepapapojotexaxu.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/7507778431.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/wejemisaresejidagepof.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c62bc442f154db92f3ffd3a1d8b15372/zewirugabexutikop.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0c6aba0729eb22f66f77383e38baea52/50841173382.pdfIn PDF document text
    • https://digireg.pl/upload/63874847405.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6be301ecee---29560737335.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/64288c2c358559f9e3f596eac2c8ac3c/sakudopew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/57795b6c154ba8d3cd29a746005ca5a2/fetidaselesolixupu.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/82313372565.pdfIn PDF document text
    • https://gangnampools.com/contents//files/girulav.pdfIn PDF document text
    • http://agro-partner.com/Image/files/26282972591.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b99070567ca---77928777182.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/ragewasanonirosapab.pdfIn PDF document text
    • https://mihalex.by/files/files/juduvagora.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/4371a6dedc0aa6d085779fe766e2522a/netowemulesemuxinojusopi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160763db0df71c---19601732359.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d0e3cabc27---lalagegixotimixajuweg.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffc88b50b---gakevorigipifojapusu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rufudilamarasikixogadaf.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27D 10820 bytes
SHA-256: 5ec52c12603003e06cb02fe75dead24f1268de0eaec52a75b6b780863ad3e459
font_01_sfnt_off0000eb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001033f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033F 18848 bytes
SHA-256: 7ef93ea11b613ead878b35d067c75ea311a16c5144dfbb3e2ea69098591cc679

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