Malicious PDF — malware analysis report

Static analysis result for SHA-256 319b5bcf42999c25…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 10:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c1f59a968b60a0f5eef2ca0c5a4fefb SHA-1: 67ad6d204d9ca83ca3b64c56a1cf4d0500a66a17 SHA-256: 319b5bcf42999c255187caa28b757243bd8ed8fd94ab4195704c0cf33723b8c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. Crucially, a heuristic detected a 'Clipboard command execution lure,' indicating the document instructs the user to copy and paste content into a command-line interface, a common technique for executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://archism.ru/uplcv?utm_term=custom+navigation+bar+android+10 PDF link annotation
    • https://vegan-eshop.cz/data/file/dutalum.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/8332595941.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/25159855092.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/giwupobidimip.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/92574792450.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/dedusesugaziwiwewopipego.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c05523303563469331d61a9cb9ff0037/kuvejezoripigogizumi.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/78685443162.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61ef679d6---lijupaxev.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/xedilisisafikukorepit.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/79937278082.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/gulakuletisa.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/ratuxirunoloxum.pdfIn PDF document text
    • http://spharma.ua/files/file/52042736929.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/2516958392.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/jibusiperurowu.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/89129370659.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/buled.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ec6f141---95200820296.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/mopazelivose.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/84530072407.pdfIn PDF document text
    • http://bushurov.ru/images/files/94344333051.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06fe0aa00---1684094412.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a6e724d17c7889362a3cd69802f11617/11931200055.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/zuropo.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/75059634653.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_off0000dc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 10924 bytes
SHA-256: 9acc691b14520b37c34678e1dfa6391f07eed49301ee948054b94df531f733e3
font_02_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 18488 bytes
SHA-256: f1d9f9a8502dc03af5bc338b4c03a8d32f330d30fbac653b8eada4a77ec42120