Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9919e29d3ce933d…

MALICIOUS

PDF

76.8 KB Created: 2021-09-09 05:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4754ae34dc6fe9572f5f9e13fcfdf65e SHA-1: de26c3828db7560f77e9dd95d88eedf5510f096d SHA-256: c9919e29d3ce933d4598cf820998cba60aafa59e70460965de6bb5927a69bc66
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to host and distribute malicious files. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=scribble+rider+free+play
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9b82d43a---wimalufesonopobabosifik.pdf
    • http://marjoleintje.nl/include/userfiles/zitokopiwuzizuvatatalu.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/85567234799.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/berazexovowinafe.pdf
    • https://lentes123.com/aym_image/files/tilelenatarupibuka.pdf
    • https://ginniglobal.com/uploads/file/50629812230.pdf
    • http://anvlaw.com/userfiles/file/36776890826.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f20c178---jovazigumedopafivawuzom.pdf
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/31563627892.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613664bad4a09---11900515202.pdf
    • http://studioguagnoni.it/userfiles/files/roxerinan.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed279d919d---dubusebinogumekunom.pdf
    • https://madame-tina.com/ckfinder/userfiles/files/21685060361.pdf
    • https://ms02bet.com/contents/files/65023243365.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8435751adf8f462ddc35538575aa9047/gagoxumeveti.pdf
    • https://activepymes.com/pub/file/40644070820.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/12914890334.pdf
    • https://minhvuongthuphap.com/upload/ck/files/gubuzogaf.pdf
    • http://kalikraft.com/images/file/monoxadava.pdf
    • http://takramaipai.com/mypicture/file/gavijuxerabagatijebeb.pdf
    • http://suphammamnon.org/uploads/files/4868036765.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/notowozitoxekiverenupabe.pdf
    • https://renhedc.com/uploads/files/202109081421057144.pdf
    • http://smm-mm.com/uploads/news_file/19434618099.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/42517236470.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c824.bin
977f21f1f80ed863df2e72e645b6644a7179896b818c53835cb0ef4603d7323f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 17392 bytes
font_01_sfnt_off0000f583.bin
2827d8b45bb6f5d1f765b11d7ab7e90bf6e75961ea4de4d16eebfa2806df5379
pdf-font-stream PDF embedded font (sfnt) at offset 0xF583 10452 bytes
font_02_sfnt_off00010d22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D22 16792 bytes