Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dce7d216aab8912…

MALICIOUS

PDF

82.0 KB Created: 2021-08-28 15:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d8395262b993cb278b68f78f916c0f4 SHA-1: c297ecb8a247ec4f940bc684111e618bc8c5545f SHA-256: 6dce7d216aab891258815a046c64b1bba6e844c49558d8ddf0d227ad9f1cd67e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://medvor.ru/uplcv?utm_term=soggy+doggy+rules PDF link annotation
    • http://dzbnf.com/upload/file///85761909909.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/7b545c63553f42b35f4b20b4091fc058/pabolivolefusazolod.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/a6c126b3ba2777ce7b4fe64d8cbf9743/62298776307.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/xifilibagamafidedudokikul.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/xadutowefofibakawalurog.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/40777904947.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/63856503928.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73536726623.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160735cd5e9048---pafepaj.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d2784e4519---pofovarogulifovugeb.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/vijuferesewukosuguvivaxom.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/dafobejop.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202108231648249694.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/zemenorovuzajirimumikora.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/05ea300c922d903deece6abcb98fd81d/bumej.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22065a6b3---rajebajozaxarugazajopusu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07c382ab71---40376267420.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b75794c62197013d6a64f3105208cd4a/fusajuroxeruwegagebo.pdfIn PDF document text
    • http://www.siposferenc.hu/html/zokukotujaronuzevox.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7209383f28543d1ecec6a94c10d03f5a/katusunapaxa.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/100258211160d9dd1da3959.pdfIn PDF document text
    • http://pr-dienst.ch/file/golafuxanananud.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9cf91d14---91673201320.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e88d89745b370a2559b39bcc6aa75063/kavajefesuxamijatit.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2c530fcbce9dee9ff49ec065083e351a/xenedenoboxafebozin.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/80214710455.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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10256 bytes
SHA-256: 2e6b8ae0062c4e8cb94f43f02dd9c4e3a805aa04dcdf3b5a65c4ab5cc0bbc7d7
font_02_sfnt_off00010b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 17604 bytes
SHA-256: 4f269d3dc268c9be718bc2902febb267ad06a4f7ae80966d7946902a7ee575a1

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