Malicious PDF — malware analysis report

Static analysis result for SHA-256 46b3915551e7a264…

MALICIOUS

PDF

119.3 KB Created: 2021-09-08 23:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6b5d94ca4f05970485c86734cb7154b0 SHA-1: 3f7230f405abc7d91e0f2c7b10d426807f3275f4 SHA-256: 46b3915551e7a264c7aee5df72cfc80f685bd963545854f63eca11ad3b20979d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to potentially compromised WordPress upload directories. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3704

Heuristics 5

  • 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
  • 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://buffinvestment.com/upload/ckfinder/files/labosegefisad.pdf In PDF document text
    • http://nyitotthaz.hu/userfiles/files/kumexesixupopu.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/89968598973.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/pukip.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/goloxikagoxatofikep.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/zobutatijujod.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/97718130677.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900567831b---22943827757.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/bosubetowezufiva.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wibow.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/12585198125.pdfIn PDF document text
    • http://idcla.net/upload/files/sunimizatimuzubozewu.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/minenajemuzeno.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/37960614509.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/riluxomobosibi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161320788046b1---momozozilorurub.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613507223e2b1---52109129156.pdfIn PDF document text
    • http://talleresjpg.es/img/file/86532551788.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/15976988271.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1a3687c3---gujizofexofudo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gosategejepufowemuvuwugib.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/zomizalowor.pdfIn PDF document text
    • https://songhong.info/userfiles/file/jidegirukobovejekugogolop.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/34390452856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+opengl+source+codePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19447 17148 bytes
SHA-256: b4fb63fd4b29ea02e49590dd88beecd08926fdedf694b83c4b2fc2e314c976d8
font_01_sfnt_off0001c108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C108 10508 bytes
SHA-256: f47450008ec17f2716f81fe1d7854102824268f7d12952a8ce3d536e14a67f59

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