Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6708cb72e72b53…

MALICIOUS

PDF

82.6 KB Created: 2021-07-01 15:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d24c0473096bd385377a2288fffae2d SHA-1: 22f7cd3db184a96886fa4364be67a85b88460168 SHA-256: 3a6708cb72e72b53f29cd5879ddbdc1804b1648b1c942a806aa31339bd13c6d4
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users into clicking malicious links. The presence of these links suggests an attempt to direct users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=types+of+power+generation+pdf
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/savidirat.pdf
    • http://accessiblevehicleservices.com/userfiles/file/57793634778.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4e372e30---wudodupovomutizozelime.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e842e0f4---54839620474.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d283f161f35d7e8692a5a9d0e6a259d0/rusuv.pdf
    • http://babywagen24.de/userfiles/file/27633269293.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f23dd39e4d---sujofotora.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cb053aec2---9174683955.pdf
    • https://gloriamus.org/Uploads/userfiles/files/76080416852.pdf
    • http://tizianaiberti.it/userfiles/files/80459021329.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4812c7ee---fevofiwa.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2e757fc0201bf50fc499cc5cab656eab/97875809125.pdf
    • https://aquafilling.com/userfiles/file/sirewuxagomavofadufos.pdf
    • http://anatolianlgs.com/userfiles/file/bokuguzeruzob.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a885f57f3b6---38332867092.pdf
    • http://files.ibiza-ferien.de/file/67629038673.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e35a6384a96087c25e47f11a1d91d7fc/vexinusofafixaroxizazav.pdf
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/2513166467.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160814e9d2bb9f---gupagazagezosize.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/9714d5c72680512399f19b2ab7dfa3fc/pozovozexinimuminafexonor.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbcb0c86a---xabogakisisurutit.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_off0000e26d.bin
24a7ef57dc8fc0130f4c6aaa1df3ede4bf5ff6225db0c372d45b793632b95f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 10788 bytes
font_01_sfnt_off0000fb50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
font_02_sfnt_off00011362.bin
23f5a07e0164fcd87a46d2416419f1da6638739e655d5a4a3d741c2b48ecc0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 16384 bytes