Malicious PDF — malware analysis report

Static analysis result for SHA-256 8660c01a7c4913c5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 01:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ee9905786b62ff7df13eb5084b1ccd3 SHA-1: 263b3f3ff14546378d9fc0811cf87944b47f2150 SHA-256: 8660c01a7c4913c5ad6d5853548f4141f064bd62849d2d2f922719fbfba15b88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to redirect the user or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/5pu536akolc9nv131vju4n645a/79169212712.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6deb5df7c---79155508399.pdf
    • https://sakura-bashi.com/uploads/files/202109071901112575.pdf
    • http://stigstudiotecnico.it/userfiles/files/bikanivisavoleru.pdf
    • https://icbacademy.com/upload/files/59561923660.pdf
    • http://usarsenal.it/userfiles/files/roxujubugawizuvatat.pdf
    • http://msinziniering.com/userfiles/file/15923378889.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161369ad196fd4---27401214724.pdf
    • https://aprenda-atdi.com/uploads/files/9664320073.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/kigopetagepaladovekerad.pdf
    • https://sunsetlearningcenter.com/userfiles/file/bakosekawobakenogoroliven.pdf
    • https://ww150006.linebot.net/upfile/files/20210908043503.pdf
    • https://x-leather.com/radsportfiles/file/dikosinoviwet.pdf
    • http://halmar.info/userfiles/file/lefibokevasiroxeloj.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909093945.pdf
    • http://www.sport-konyv.hu/userfiles/file/72961081433.pdf
    • http://yds-wcv.jp/free_images/files/vamenonepazale.pdf
    • http://bakefruit.com/uploads/files/202109052150047702.pdf
    • http://kredoteka.ru/uploads/file/kabokelusagijesodinagoxax.pdf
    • https://ahl2005.com/ckfinder/userfiles/files/75095596703.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/rufunujekofedisuxati.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/mukonenadotaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dcu+justice+league+war+full+movie
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/51899951375.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_off0000da74.bin
8976919ebf38f3739a9abedee4085551fb4e7919c4c5a7b75e0862733880624b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 18100 bytes
font_01_sfnt_off0001097e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097E 16792 bytes
font_02_sfnt_off00012195.bin
bdc32d118c309ecd33f7526e0de060e557d435e78c791a629bba3673894ed9b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 10956 bytes