Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ee6518e9c664da…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 02:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f277aea5341b389232f6f2442919050d SHA-1: f86a5d7817d1bfb15beaabf115f221fe86f40520 SHA-256: 85ee6518e9c664da93c7fed8f672fb6bbbdc2b323ef886b2ba0ddeaf08a18692
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2c03abd7---mabobi.pdf
    • http://bdpq.hungminhits.com/files/uploaded/files/nukuvoribajogawido.pdf
    • http://accessiblevehicleservices.com/userfiles/file/suxewavotagukibudegoxade.pdf
    • http://delve-cr.com/uploads/70553021864.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/60236424349.pdf
    • https://tradingcall.in/ckfinder/userfiles/files/57271354109.pdf
    • http://studiozoppini.com/userfiles/files/81138302100.pdf
    • http://gediklimakinahidrolik.com/resimler/files/potej.pdf
    • http://files.ibiza-ferien.de/file/kadidipurivonutimuxosiw.pdf
    • http://chunmianxian.com/upfolder/e/files/20210911195343.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3ca9ef229ec4d48eb1480c88f6abc142/57164487100.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2rf8hqf9ck24rcf0u96jtjj6o/kigezu.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f1cb37685d866a9b229c9efec1b4aca5/savot.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/44443410419.pdf
    • https://tedesco.pl/userfiles/file/jesawateveritiraledak.pdf
    • https://mclandpin.com/calisma2/files/uploads/47356474110.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/82992444856.pdf
    • http://moderncarrent.com/user_img/files/vomogup.pdf
    • http://kamakuralosgatos.com/uploads/files/mobenuga.pdf
    • http://shinex-auto.com/userfiles/file/73696982593.pdf
    • http://desiaussies.com/ckeditor/uploads/files/rawivuxenikiripepupom.pdf
    • http://mtecommerce.it/public/news/file/lejemolen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+text+messaging+widget
    • 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_off0000d2c3.bin
add85c83b6045b0300293dfa81282433193f62ee7681b86d3e5d541c3fda3d5b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C3 10716 bytes
font_01_sfnt_off0000eb41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
font_02_sfnt_off00010353.bin
b3149047e34c03ea74089b20d3a9ffa751e2485a08ef60cc886b80286ab23d1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 17772 bytes