Malicious PDF — malware analysis report

Static analysis result for SHA-256 f513fb52140c0dfe…

MALICIOUS

PDF

69.8 KB Created: 2021-09-07 04:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 534a891d5726b66a4649c9080f1890f1 SHA-1: e017fa6c0b9e4585a6260629f294f25316f2aff3 SHA-256: f513fb52140c0dfe7edb3285d7b011cba4e4c5cd4b02443385dbc5bee812230f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to disposable hosting or compromised CMS upload directories. The presence of 'utm_term' parameters suggests an attempt to track user engagement with these links, likely leading to phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chinahongji.com/d/files/tuzabiza.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/29283830785.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/tilikemujaxatomekakuxunuw.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/fmv7lsl2uisdi77j20s7censp5/velokifuvasuz.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/67015707686.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/37749420960.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/6343388656.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7efd698e6---dujirile.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/menagomaben.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/zojegimufavuwe.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/xuvulekoborori.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9c4d5aabcb4a9978daf9bb42144a87a4/lobenawefebivi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/femolikedesunebetiteraj.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef3d8d1cb2---37898814694.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/mawuvudaboku.pdfIn PDF document text
    • http://progetec.org/userfiles/files/84402848170.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/xokop.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc673d5c56---tudejogitez.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/mafabad.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/zixiro.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/jikalivazepugosuwamulab.pdfIn PDF document text
    • http://absigorta.com/E/file/xulidezajofafe.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20b844c92---duwutuvuwitom.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/779a120f0b5561043b1222ae56945274/43581435349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sinistromanual+word+originPDF 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_off0000b3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 14952 bytes
SHA-256: e7a6f1e74e5a9e86250176ee8b3dc943c35812f885a8d49701ce4a9603a1552c
font_02_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10720 bytes
SHA-256: c4569e6c2f163dfb46854e47831212fe474129ae47979cb5d50beabb92d6d031

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