Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6898560e1f88b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 11:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d4c2b07480315d360cd6464b07d938e1 SHA-1: 018c1c831d36ca33575ab608ff11b97a1c5f044f SHA-256: f5f6898560e1f88b9bbabb992947a33a9ad8f0d60c2780dd7a25530e99241575
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious content. The document body is heavily obfuscated, but the presence of JavaScript and the link farm heuristics suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myphamasia.net/upload/files/waxezujifofogarepe.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608290d5a815a---4836841766.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/kerufikinepelidowesaka.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/kudimozu.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/kuduzexot.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/75296386838.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/31576570170.pdfIn PDF document text
    • https://petala.gr/userfiles/file/74033263103.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/xodagabaxobarafebi.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/terebipotezume.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e90ba8308---81154308095.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/8654396e0371855951b1b692d6c46d60/nijamuwigatuku.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/45734005603.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/mibaxidekedure.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/58007324164.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080907035810.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nh7elo6gnci556i989tvsim2fm/xefodekibasarowakibadib.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/6973205921.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb5f91f6c---39515467374.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/98669445337.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/15388095231.pdfIn PDF document text
    • http://m2m2design.com/userfiles/62001466281.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/54321b2f8b9ee75bf7408364c54f57b4/ximoxijupawilamilaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lista+de+nombres+y+apellidos+de+personas+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 18724 bytes
SHA-256: 4a27f217dad626fc709cfa3154a2eae5ba7f119bc8a283a3532f725c4eb4de1e
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 10872 bytes
SHA-256: fc02ce500cbb8aeead5631720583bcc43bbcceff23fb4a907efef1a932ca129e
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1