Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c4e34213ac22e2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 09:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b175140d0aa66398ed65669a62d86ab7 SHA-1: cad08c3fa2d3818efc78ae34372a51e1045e5df2 SHA-256: 40c4e34213ac22e21da198e9c9444208fab61314d53300f9e7b27ebb30d71017
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7801

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 http://reafamily.lt/ckfinder/userfiles/files/zerimolutad.pdf In PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fad3d1fd81---mafirenifafupiza.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/robajomiponom.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/susigav.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/nizumazisulow.pdfIn PDF document text
    • http://emannsltd.com/userfiles/11330524477.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e867dcdc---38519975112.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/jedazelixelisadaror.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/23334073893.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/40689b23f58cc298b8e4542e9c319c4b/65887949176.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/65154610423.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/kikisuzixusotomizove.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/gofegugig.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/jodijib.pdfIn PDF document text
    • http://garderoba.sk/images/_file/nowivolawirirurevusibu.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/37206276648.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32857494091.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161475170f3d1b---60173947822.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/laporerunitapuju.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/perinobafejolupavopuw.pdfIn PDF document text
    • http://archbot.pl/files/file/zepozejevafuserosebu.pdfIn PDF document text
    • https://alev.az/userfiles/file/xezotikafitulu.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309924279515.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/72887181616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ich+folge+dir+gleichfalls+pdfPDF link annotation
    • 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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 21064 bytes
SHA-256: 9d03b07410af730a4484f1d75cba2a9f8432f9a53325481fd06ed01a7c6402f4
font_01_sfnt_off00011777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8E 10648 bytes
SHA-256: 1272d0bbb3835b5ecdfa24d036a78e2256d61496b3d66a31b662fa610079be8c

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