Malicious PDF — malware analysis report

Static analysis result for SHA-256 984e753c53cc667e…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 22:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b516ad86e13cee7fe647b134d5467ea SHA-1: 4e1d2a2cd3f19f6f4301a866e2e105efa36fd63f SHA-256: 984e753c53cc667e47cfca9584aeddbcb5c735b647f5e59dece7d47f7a3e2c95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://irlanc.ru/uplcv?utm_term=3d+shapes+worksheets+grade+2+pdf PDF link annotation
    • http://zulassung4you.de/bilder/file/mumajidusagubegejomufelat.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zuvike.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/85443342513.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3db4c46260---75115856456.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607715329cdca---ruwaroz.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/metoputar.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d27143ffa32533c1130f3419c7ce874a/55559752957.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/vepiw.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/60702989988.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/remagedipewurubolaxozo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dff211fa572ffe84a29124e8874274a6/loximujar.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872b14b43c7---mowurositozijakuko.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0ee5ae0b2155c8fa2bf57f67ace3d03c/15429957289.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/549a5569a1a486a7ac420d937de09676/32926974410.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/benurunatiranivojumij.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/gedalakok.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d04b98ea5f---28062893887.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/gedefavoruvep.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/da0bf5e7d1c472e65e09ae4c1bb7179c/76421198737.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/boxutubotulikamutuv.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/nudoxujufozugejixatiduz.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/79132171958.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/36223631585.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/93752876327.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16308 bytes
SHA-256: 83c843498363a082a189b6f2a6f941f479c07ea8bd0f142e593493bd370afc1a
font_01_sfnt_off0000f4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 10908 bytes
SHA-256: b149ec6935aebd8d42b5d602c4a78f336a40c505aadc1eaf0316e26a09e235a0

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