Malicious PDF — malware analysis report

Static analysis result for SHA-256 989af8f8ce52f6fa…

MALICIOUS

PDF

76.5 KB Created: 2021-09-24 01:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1c9e1f700b8f3c62ab8c9ebc108dd0a SHA-1: 2a4da6b95868ae6131bdf32003052108735913ec SHA-256: 989af8f8ce52f6fae3d736ad9a5d490910eb1fe7e0fa8b7f2e193e998d571497
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to distribute malware or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b512f0cd83---tilepiji.pdf
    • http://bdn10.cz/files/file/rovaxinoropasuki.pdf
    • http://louisamerino.com/userfiles/file/81743857629.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bvvpp91opnjh0qqkbk40fo58g4/44781413296.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/fa9e28bfef7779ad9637f531e023ab5c/fokivod.pdf
    • https://somos.co/dleyes/admin/fotos/file/mupapim.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a725fd1629---fupazopi.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/88041283649.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614572e93dfd5---59203610565.pdf
    • https://mtdind.aicsmindia.org/ckfinder/userfiles/files/vidojivalapitexesizozojo.pdf
    • https://j26clean.com/upload/files/vamazanakivapivaromatab.pdf
    • https://dananeye.com/uploads/files/202109061853372041.pdf
    • http://cs-golfclub.com/ckupload/files/mejakanimene.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/44943859953.pdf
    • http://sun-green.de/ckfinder/userfiles/files/kowotamaxawofi.pdf
    • https://lostfoundglobal.com/userfiles/file/soxegonesozof.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/nigegisemime.pdf
    • http://potlista.com/file/files/87671766304.pdf
    • https://rawoctane.com/uploads/file/sojemezubovozatu.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/diwafepivasoka.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/87801448341.pdf
    • https://yourwebcenter.com/files/file/92157109335.pdf
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/49207054906.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+block+calls+on+my+verizon+phone
    • 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_off0000c701.bin
fa9d16240637b8ae9d80f369a3f81cf4de7b12d4a5a26f055448ca016314c0ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC701 16636 bytes
font_01_sfnt_off0000f1fe.bin
56b5fef23e11693a4aa7a24597c88c5a099ebd094fc9c918754cb52e4ae0275a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 11232 bytes
font_02_sfnt_off00010be9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 16792 bytes