Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedeeaf37e5418ae…

MALICIOUS

PDF

89.2 KB Created: 2021-09-05 03:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: be93df0542cfb1169589b916ef760dad SHA-1: 31b5af7a29acdcfd36019a0f1e6fb5ceb837246d SHA-256: cedeeaf37e5418ae30ec652f6203f73c57e372a1db49608311eb55a8046d7267
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm nature is a clear indicator of malicious activity.

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://www.truck-transport.com/ckfinder/userfiles/files/botovilikej.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0604/dbfd55edf3a34c7c29bec7dd22ecd89c.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/24318111760.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/pewuduvogijabutaxosi.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/xepukesinajezarebuxop.pdfIn PDF document text
    • http://ranchobg.com/img/file/junijelexumojepil.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ps87l0uh40kbka8ie4425ocs60/toleg.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f9d8ba7a3b---77701333237.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/sodadupuwakapo.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/dijin.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/povusatajamodeged.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/sokoxego.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210814070030.pdfIn PDF document text
    • http://mp-journal.com/media/file/gonemara.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e7pgd2912g2siqonf49c1vbqt7/4337434567.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/modagibedefebojevuze.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/defoviwurunajikibipomepax.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/61041917758.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f28e5f000579ba4b8fbc802971d12314/zukorivazuwonifolo.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/33tniit5q20ekcegkkej2k9282/66539948873.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612df9fdf324a---92592186835.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/04d69e8eeb4ce0ee9abbdd16d79dcbe0/83354864473.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/74577226923.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/124c0e9932e510f35c915749611188a2/kepozusadakozuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=la+bella+durmiente+cuento+ilustrado+pdfPDF 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_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 18740 bytes
SHA-256: 8760a7c3277adaf86a25056bf3bdffbb929c201bddfd9e0083f5f0c30bfb5c9a
font_01_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 10976 bytes
SHA-256: a101c98ff903a49ba4e98831573516eb404f0d04a16e9924096af2486f808b7b
font_02_sfnt_off00013cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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