Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d5cf636fdfbd6a…

MALICIOUS

PDF

77.8 KB Created: 2021-10-11 19:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec1d299e17022ea62bc7a13b0fc7970d SHA-1: 25bff7d230149b9f34c77bb26dfcf4e637a03cb7 SHA-256: b2d5cf636fdfbd6a784b0b8b8405800954bf1ef81a47104abdb22fbba9165a49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1071.001 Web Protocols

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised or disposable hosting sites, some of which are disguised as PDF files. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://royalgroup.at/tmp/ruduman.pdf In PDF document text
    • http://hitplus.eu/userfiles/file/gewelo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gabudepugupusude.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/gisiwadipus.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/4090653618.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcebf54f24---vuwujipo.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/mabisanaxavakep.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95d3d27476673a02895e3bb74924fd81/sijasogumogexuvaxezil.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/34228460213.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/40888842963.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/ladusiluniwe.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/wawagesoriligis.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/vujopabojona.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/wufonenutopof.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145aa585352e---21764983223.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/56374322197.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zulenese.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/namivejazixejili.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6ca798aa1a148abb1ef7090887371a4e/59431752498.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1a905e1cc8a228b2b3d09cabfa0c52c2/baderimaxesukedos.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/2563571837.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/24994032065.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/jekagalopaliverin.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157367714cec---zorupewexogabisebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=sonic+all+stars+racing+transformed+download+for+androidPDF link annotation
    • 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_off0000c683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 10980 bytes
SHA-256: 799bdef83d0cb96896d087f2c19978cde35fc99e49818e7f2f892a6ca03698af
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 18608 bytes
SHA-256: 3d8f6fba90c003712e342aff52df883614c3423f0c8ced2cce39039aca78d8bf

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