Malicious PDF — malware analysis report

Static analysis result for SHA-256 379a5eea56c1da92…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 16:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c31ee2a90e8f389ce37f86dfeb75ac17 SHA-1: c03a8da2a49e426f02e47ee0dcc4fcff5ad2257a SHA-256: 379a5eea56c1da92fd607d412e60317d4ab105867825ab8ad647643d921581b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 http://dytac.hk/userfiles/35740831996.pdf In PDF document text
    • http://cdenito.net/userfiles/file/genunifijusidoxoxomaxanak.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/15588413375.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/wiwikebedupebos.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/45659269321.pdfIn PDF document text
    • http://northcity.rs/slike/files/80191341416.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/98578357674.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/44493023289.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134f6f58a1ff---73448588919.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/85202146070.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jrauu0nq889me2cf1v2cbdj3b/29579090282.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/jarugupepewekosawefalevet.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/90148827305.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/rosanovimisawonopa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30a07e92df14a5881395ccc79e79f793/29831312905.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/lugarezifo.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/7231346615.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/taxeba.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zunilok.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54ec96c06---lamaxutulezuwifoweko.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/28362312280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+get+nitro+in+discord+for+freePDF link annotation
    • 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_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 18280 bytes
SHA-256: 933e7bd86dd1ee58bbdbd9cdcf8cec1db812d54d5208a335c38b216dc714057f
font_02_sfnt_off00011ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC7 10520 bytes
SHA-256: b28bd03bb7e0f54f05a4a3eae8b27e819a40e748795c07ab7f63fe3db8083983

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