Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace5851d991b4465…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 05:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48aa069f6744614740be831e5cff4d50 SHA-1: d1543c8c1284d03b27bb6eff4950f554098573c1 SHA-256: ace5851d991b4465a5012445adbe864c6bdde07f68a92df1cd9c8c434658712a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://medvor.ru/uplcv?utm_term=santa+claus+is+coming+to+town+show PDF link annotation
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/th550gbm9vb0nc0fu5j23pkvfj/bikaxereliwolukijemero.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/813772e4c2cea61a903b38c82b8d41dd/11635949882.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totumefasusagasuzid.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca91fb3fe7---64409171486.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b222c03cf23---89353183084.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/b2ntvim4ee3audf06apqclqbl2/lukadukefopidal.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1f7e7ea867377dbd153a24033e3225a2/ganin.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/70dbfaa51345ad90d5878a052a59a4f9/49426765695.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/sefoditiwame.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/p911m7un82fgc3jm27anv9cdpn/vovepuledonaxigob.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/64967313465.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/82508865967.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/64ec2d5805ad944cbf78cacea56cb3ca/bibugezanozi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91965d662---41766493715.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a66436dfcdb---mipefobixorewomezus.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec97b29666---vukisovafe.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/jumalopa.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a5dd23c7d923762975786281435cfbc8/wuripemamijitol.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9677b5f6db---jamofokubajuzagemelavig.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7add9142e8f3288f8b4285335d201df8/gofawiramafoviwekizij.pdfIn PDF document text
    • http://360mart.net/uploads/files/61132399673.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210504014523_1988154670.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/c77i0tcgi1pb9vvk5il8hr8v10/83233057668.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuxalejujagovikun.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/3d83ee6070530a23ed970cb87395b687/wunopenawix.pdfIn PDF document text
    • 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_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 10708 bytes
SHA-256: 366b0df9134118f5f652d28d549cd8f3f0ea5e4c68b32f4d968362d4b2e33bb7
font_02_sfnt_off00011ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECB 18696 bytes
SHA-256: 438dd923d612fed851a576db7fd022b51c3c2febeb6ae538c24077d208f5d4ec