Malicious PDF — malware analysis report

Static analysis result for SHA-256 d959532d01bc4b44…

MALICIOUS

PDF

85.9 KB Created: 2021-07-18 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ad41cf4ba238e30be029a52c734f2e1 SHA-1: afacf9b54ec63569219b71e3358ec7b94123653f SHA-256: d959532d01bc4b44be55a3e4f42b78318e5e7e846e2c7fa3847e98e64e7d9ec6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1622f91977---vezitexejipodezinamafoxi.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2gs06kse6e0je13dhlju2n4pq7/toxagejulogakafaloxaxige.pdf
    • http://abwlanham.com/uploads/files/65391337297.pdf
    • http://angelcabrera.com/FCKfiles/file/varinamorusebagepolo.pdf
    • https://lochoanggia.com/upload/files/69783031640.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/88c5c65a67cbf8983c33da92437c1da4/2766384345.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a325cb6efb2---66425510423.pdf
    • http://interface-referencement.com/userfiles/file/64095322772.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88001b7f76---rigoxezi.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/95e98fb181700fbd5e6bc073c06b7c4a/57512786743.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bf475ea0---xinofaje.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210527021720.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/49736922a8a6575e83feca2dad15872d/dafoxaxijavaseduzapawed.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948141bbb17---41516899457.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8ec6f8b2---gowaxeropin.pdf
    • http://quickvideo.nl/userfiles/file/63508786824.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/dberi1mjq9qa8f490ulsmrlfpq/jolekeniwowunagaguvosama.pdf
    • http://biolabsrl.org/userfiles/files/fozuronaxefepimasom.pdf
    • https://edcasys.com/ci/userfiles/files/kizebesumumubenorul.pdf
    • http://apricomm.com/userData/board/file/xutoxojozowipikowubojimu.pdf
    • http://esipro.fr/userfiles/file/27149674664.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/550djq7en8stuh9ldkc9a464a0/wimileronapajejiwetubu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=imo+chat+video
    • 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_off0000efb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 16792 bytes
font_01_sfnt_off000107c7.bin
0f6e6bdf3efdaa7fe3d077f3c98191512f20c5a4a645749f2c8b9973ad920c17
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16860 bytes
font_02_sfnt_off000133c3.bin
c2de900e9b83f5799acc59f9a293ed28073c6224ff5a6946204fa2714b6aff4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C3 10232 bytes