Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79155585e8fa90c…

MALICIOUS

PDF

77.8 KB Created: 2021-06-30 00:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba1ecfb808b4eecc0ceed12ee63329b7 SHA-1: 34e39e2b7222d6165d945de470b460dbad011a57 SHA-256: e79155585e8fa90c881c2e4ed54765882381fa4dfd6c002642f63f0eaceb9b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded links and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=charles+university+faculty+of+mathematics+and+physics
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3986a800a6bad27aa9f39d4861d6bfe6/fetef.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3252e380---zufanowesagopomomibixex.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/8aungip0gfid4lun4b3gsdj1f2/xewukawexapolowunexero.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/kemulakakokaveminuwoz.pdf
    • http://mywayrtk.info/userfiles/file/gupinumi.pdf
    • http://apexibd.com/uploads/fck_uploads/file/28639173941.pdf
    • http://ingmontagna.com/userfiles/files/38608147213.pdf
    • https://a2designbg.com/userfiles/file/71833841976.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc473150142---nujisusa.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/il1cfslhc123hlbg2rhca6jvfe/minebabawi.pdf
    • https://getadoc.in/ckfinder/userfiles/files/57618987232.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03772bd32---fuxatudunaporut.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0ca6733cc9d54b1570849c7163f91aa7/23011437837.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ada08317255---25902360259.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff8fe0864---51000628179.pdf
    • https://tappowine.com/file/82164654398.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b04e8080e3b---61763226991.pdf
    • http://udmvdpo.ru/images/files/rogef.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o43fkn4l61q9ep7l3667e7suf3/7822786660.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4aaa23b2---ranimuwotemib.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8qj2rokoskpbq27h1gl5rs8vd4/88429688548.pdf
    • https://infiniteprospects.com/FCKeditor/file/damamojigatakozigukojuzun.pdf
    • http://beachfirebrands.com/userfiles/file/pezujuvova.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c23d4aec2---81328007072.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/stbomb1ac88ummm1gubej9eplf/nofisukalimedizolepijuro.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac452b06287---namifinifufibafezezusuge.pdf
    • http://cassotech.nl/site/data/ws/files/41520278327.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_off0000c826.bin
555d06fc7803d82536822a1c97b64824ee50adaa0331cecd49f3df4b91669477		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC826 17972 bytes
font_01_sfnt_off0000f519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 16792 bytes
font_02_sfnt_off00010d30.bin
c2fedab7e4d8a46682863e19730a5c7318dcdfd98f6c5bbd772d1c62da740dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 11196 bytes

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