Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd6cdbd52010ded…

MALICIOUS

PDF

158.4 KB Created: 2021-06-27 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81d26ebb84bb120a96f81418549c67fe SHA-1: 7ca854ffe61cc4b82e97a13b655c9c029c4a912c SHA-256: 8fd6cdbd52010ded1d2defde4d14cb81684142c82a7d1a5485b4ec3932bd6e97
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, including those hosted on compromised CMS uploads, suggests an attempt to lure users to malicious content, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b32de312dd4---58684215175.pdf
    • http://hoctienganh123.net/upload/files/kenava.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b38df81af0ad5b1fbfe2613e7c4a02e5/tisonoke.pdf
    • http://abw10thstreetne.com/uploads/files/nivodanusudegareludonef.pdf
    • http://gmkms.net/upfile_editor/2021/files/80178497486.pdf
    • https://adepotcustom.com/UploadFiles/file/20210503135423152.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd2a71657f---reradumaduj.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3596f8b---25254621914.pdf
    • http://csc0535.com/userfiles/file/20210625061440_yfm6mu.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/98634ffe4f18cdc9e580c33e02a3ffb5/3918180579.pdf
    • http://absolutelyneon.com/userfiles/file/pajumesuwekimisijupogafe.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9bf76779---26670044764.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31e21e5ad6---firufozefuzigilisujapop.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/zakotuwogemupubepodu.pdf
    • http://angelcabrera.com/FCKfiles/file/bonid.pdf
    • http://18554080.com/userfiles/file/95492158205.pdf
    • http://axwelindia.com/uploads/vetugunup.pdf
    • https://autotrans911.com/thread/admin/uploads/file/63299736444.pdf
    • https://klcmekatronik.com/ckfinder/userfiles/files/pajilusoz.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/05315c4cffa0393d55437db18558f994/dikemusemel.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbba4f06df0---bapumimusezedatenabizu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oh+my+god+forgive+us+our+sins
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001db9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB9E 16792 bytes
font_01_sfnt_off0001f3b0.bin
b43b090145fba871f07ab51f027684cd97866e9b201061553c361a129bd347f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3B0 33332 bytes
font_02_sfnt_off00023b3b.bin
0e779a7ab94a83413b7c458a679ab6fad3da222952ed9be94dffa948c5cfbb1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x23B3B 10800 bytes
font_03_sfnt_off000253bb.bin
3749a98ed173e8edccd2817a043599688a1baf9b05897269324c978e168c3c65
pdf-font-stream PDF embedded font (sfnt) at offset 0x253BB 16920 bytes