Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6101ea21d080e1b…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 22:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 345b7043f510cee1d69e73317fa5c345 SHA-1: 109b19676e1c5f4b31706eab77c1e007ccadada0 SHA-256: a6101ea21d080e1be3e387a79cdcb80cab9a13f122c2ae6c09608443e349a4a6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination and potentially leverage SEO tactics for broader reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=gaskell+transport+phenomena+solution+manual PDF link annotation
    • https://akproauto.com/nbloom/fckuploads/file/rorigezitopepu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3ed9b456---86116273976.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81c5067f9---43921718930.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d1b9da30d---99153566835.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/larigivaxuwezibikixuruw.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/ziwoj.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/14346558720.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/70343967076.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/xoxulilodud.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/45670298309.pdfIn PDF document text
    • https://bauarch.bg/files/36896888159.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/78c43635696d730f101fdc441c63d683/51397584510.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/7570147315.pdfIn PDF document text
    • http://tion.hu/upload/file/roboxa.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e68122b---dazosinevapopuva.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/15797368476.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gebelezixuzegun.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/80685499094.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/143c0f5e3b03f80ebd4041cce2ab1b0b/5852518739.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bebe3a787b---11925320435.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/96528570517.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/gatuzakejak.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/xememoboxanobopi.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_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001181c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 10748 bytes
SHA-256: 77c823f1a8ff38e08e13b07d9a3eb4d803546833574e2dd56f8b0b1b07c08164
font_02_sfnt_off000130a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A1 17988 bytes
SHA-256: 667d3d2f441a2019827cf5b5ba38a51012675ec09b22ceec77c874a2259702d7

Open this report in the interactive analyzer, or submit your own file for analysis.