Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b58b38bfbc6678…

MALICIOUS

PDF

109.1 KB Created: 2021-07-07 19:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85859f5e8a7a26cab90931b571d6512f SHA-1: e9a72a736a00da7498ee846e9b402421d413243a SHA-256: 98b58b38bfbc6678ba37b5d806ec0011e589350c4548a526c4d3ab99aaab169d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farms indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/496febf254d62a0c668f442c982dbb1e/26198126929.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f563b8e2a---56202253022.pdf
    • http://ctnphrae.com/ckfinder/userfiles/files/lonesozovegaravovitadej.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6eguah9841mpbrfeaje3d4vei6/jobafu.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78137309a8---kipojusa.pdf
    • http://highendschmiede.de/highendfiles/file/jogegage.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4f559594d46e381cf47bac43198ac084/73158602665.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecff628f92---43457706771.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cebf32f9---zaradisepenafalo.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887cb8dc295---63203549708.pdf
    • http://apcmagon.com/userfiles/vuximegudovesutiduxivo.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8df831b74ee218d558cf05c2732262ca/ximife.pdf
    • http://euro-ex.net/images/blog//file/64986069614.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ig5556l0veg2rvpvgaf1h44km6/86536032039.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df4eaf1bc4c---totemete.pdf
    • http://markasib.ru/ckfinder/userfiles/files/87003205390.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f0699a2178790d3d4362e7a4f26d4565/63144160300.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/88388002962.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/cc66681e083bb1c421d7a90da7e1bfd3/90552802819.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091f092cbe68---27020002955.pdf
    • http://foto-preiss.at/upload_files/files/4079949139.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vln59ksa7l7r0l9k0ribvot3e4/vususumesoferinavizof.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f27d6f0c---fikosabotifibowiva.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074963179ef4---midefagemij.pdf
    • http://modnyi-buket.ru/uploads/files/jonoxotesekomob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+walking+dead+season+4+download+android
    • 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_off000148a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148A7 16792 bytes
font_01_sfnt_off000160b9.bin
d974fe0353d578c26fe54bf1ae8e8e5523869f556b0f7155e1b707279b866de3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160B9 17500 bytes
font_02_sfnt_off00018ebc.bin
c8105d7057228acf96f20939670325f2a51278f3619bd2175c5a1bad61401829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18EBC 10648 bytes

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