Malicious PDF — malware analysis report

Static analysis result for SHA-256 a081cd5cdb4dd0a2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 17:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1eb4246ebdd7f4abe3e1a8ae37c1032c SHA-1: 54a0c0d0fe7181710bb85e1eba5268d5ee1b6d28 SHA-256: a081cd5cdb4dd0a245d6515d9c7b2e1e8e3d3d0dff05d47fdd9f49674efc360a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking, common in phishing campaigns. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=damon+ps2+android+10 PDF link annotation
    • http://agavietnam.com/img/files/77794478752.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/tofuguwori.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb0cfb8c31---bapapebiwogaridajuburixar.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/forevaboxisa.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/kipivasilosukijura.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zujefokowovefizuxer.pdfIn PDF document text
    • https://ksboutlet.com/file/files/94889467570.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/27d1e682cb95cd37bc50d7e95331eb41/14674022550.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614433456d348---xenujegu.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98433418927.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/77597835817.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/13662884492.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gipiladinoleti.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/1684997155.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/misuxuvotuzawarobi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/23978989710.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/nupibolu.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/16186096090.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/ledebiloj.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/58402879231.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/mukezolizukilu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/udobug4jvbl936j26nm2iq9cgo/xalopavimorasivikariwi.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_off0000da69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 17272 bytes
SHA-256: fb295cd4e120009c8b125d29f4c47935e1fdec61febf9c2709cbabe94f3b85f9
font_02_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 10572 bytes
SHA-256: 8033354b2ce7f2c65de11f185ce7b3719ddc7720c8f2e806651004aa76c11331