Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfc91f0ede76b16…

MALICIOUS

PDF

86.3 KB Created: 2021-06-15 18:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb24490c2318353126c5230c9ce501b SHA-1: ca5586f236eb6681e9ac3f89d864fecb70d0765e SHA-256: 8dfc91f0ede76b16acd7654d85b0151c8d3d4dc7d8e5262bbecccb7dd9440321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document uses a lure related to hacking Wi-Fi via Termux, directing users to multiple compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=hack+wifi+using+termux
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a6089aa43.pdf
    • https://zlatartopalovic.rs//files/53517999831.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c7fcd0---75455603998.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2b7354ce579ab601ebb940ec90e32416/wunutobesuzabi.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-1/20210501101516203808.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160719ecf27b50---37924680161.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d006u1f62i32kjfhmrfeouuss3/luvijotufuxekix.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1b465efe---2671113234.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dqleqjj1hod9lobkfjr2a5up71/wupipuxuta.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74e084e9e1---46730270173.pdf
    • http://akinmedikal.com/uploads/file/3612704306.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc6a71b1d8---suwikaxiwe.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e3f8b39e910abb8e5d9a3e7ca381001/zaxokakidataro.pdf
    • http://citescolairedeledit.com/include/file/zusumizaxajopapatupepewol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e865.bin
635405b76597b639fc705515d5d5da6d38d538face55b409f83973e03691553b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 5128 bytes
font_01_sfnt_off0000f9ca.bin
90066b97b495acbe91ecb9e4ddddb99662176f1f9340cff37059c5a494110acc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CA 11588 bytes
font_02_sfnt_off000121ab.bin
4356b11da9903445c958d28e851bca9c3829fbb7e834bfc55bd09155b50df79d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 18164 bytes
font_03_sfnt_off00013c62.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C62 4324 bytes

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