Malicious PDF — malware analysis report

Static analysis result for SHA-256 352129dfbc574e1a…

MALICIOUS

PDF

97.9 KB Created: 2021-07-07 01:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e1fbd3bb9fe643f2d8f890e23bdface SHA-1: 7e78c6d2e740914c290a844171fe0872a6c8d7b8 SHA-256: 352129dfbc574e1a20705230fa6829f5b212388f28436bb049da89a81df79319
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://laborke.ru/uplcv?utm_term=dictionary+of+biblical+theology+xavier+leon+dufour+pdf PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/afab0b9d3305eed93c98164cff52290f/49333602420.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/vibajusilokodinosotowo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/qpol4tihnmkgbu39797cgn81f7/zilum.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/fomusududuwetutowaxopina.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/xatenigigunelutin.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/798c21b3994b46dc8cc5c953db92d21d/79177634640.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a23b73a59e74ea73f90e22a3463eb9a2/roroja.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608413c6da964---72009317382.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/depupugasepejadizakutip.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/vogazes.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093746e13582---kaduw.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/68e8958e0d2dc0c449f2852c2988dd15/97445798766.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5d352afa---pifukixejabinosoxoki.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/65567513590.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071214f908af---figanamoka.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b15d1229065---rofirulopu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0gf3kjdu8mil5pnopcds3k9rar/nabegatazoridadatijixu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/todamipewowekipukirezeme.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/9dff11703d2312d8c014fbc7d1e09207/toroselivanud.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/11229182158.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb16c6c12e316c06cba7aa4f357882b5/34511464403.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rarolotexa.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/30878668705.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ba700c1f9---zuterelupugezexodidiben.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986acf2ea8---bulivaxemawugaponanazojox.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bad38fc7b---xituk.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_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 11256 bytes
SHA-256: 1a91dff81a106fe1dc80f124872d8efe3f51920e7fbb36d374bb71f7a65605ce
font_01_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 18244 bytes
SHA-256: a776b42af0b4e3d0313fa3670fd78364c1e70097417d6ddca094db134aa047de
font_02_sfnt_off000161a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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