Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e721ce5bb8fc4bf…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 01:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b8b846d3a85c80a9cae9cd21a8672d0 SHA-1: 9fbdc4eec079c8d719b03b994010906714e288bc SHA-256: 9e721ce5bb8fc4bf9d1eaf67e54e4d3a670b4d868947ebddd9efa0306862da03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, likely intended to redirect the user to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/44143501650748d79433b1ee93119429/7352281039.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9nqnf3lr75qkk561pq6arjj6pf/62061806376.pdf
    • http://aristosaigonhotel.vn/uploads/files/majuzomubavited.pdf
    • http://zuche0551.com/upload/file/12603093867.pdf
    • http://namngonviet.com/user-/files/potemaxexanusededipug.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bb0b8e24d43ecf5af096f43f1c2c633/80824751121.pdf
    • https://coevent.ru/upload/files/rezepanunisaguv.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ca1ceac9ebfbc4af70d02b639bc7beb7/42766320078.pdf
    • https://altonika.pro/files/fck/file/fugasurolakazunafe.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/qdqgqqqfpngdje1visfoanbelj/doladubomejizixuxirasiniz.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3ea0bf6c3ec20377d574e3410ea0ac4e/xuzawaliv.pdf
    • https://clinicscrm.com/img/files/860729510.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25f4b9187---71670655235.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/10727565620.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/5q3s9cqh3aj7tpc0nnrtvetta3/lerigugunojabatijotur.pdf
    • https://netiko.ge/img/Data/file/52405215656.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/o1b7osdreg7ecvvuhjuvb82565/xiradakatepiwikujukowoga.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5c6638351---sezajinalukifave.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/357caeb23125dcfeaaff6f2c1027166c/letupopuvetebej.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lkc82rk7rqrcqtullinjj7iqke/47053649517.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801f85ef963---89191111102.pdf
    • http://aaaexpressac.com/userfiles/file/43757953758.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hairball+in+dogs+throat
    • 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_off0000f3d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
font_01_sfnt_off00010bf0.bin
904803f4d0c6f670a73feebf3fa7c1a6a609c278777010e6ea91a1e63d7ed46a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 10524 bytes
font_02_sfnt_off0001237c.bin
ff504902d797a846477110f15830a8c74ff728d557ba39e76c4977ef7de390e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1237C 17024 bytes