Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac746cd403105b46…

MALICIOUS

PDF

143.0 KB Created: 2021-09-06 02:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7b6cf6763dd2654b3ea604f150a0b20 SHA-1: 1a2fc125a5909c8f110d665e9560a0f201ce4785 SHA-256: ac746cd403105b46a30217bc91fdb2b9955639314e0a8665ab7b914934fd7b57
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4463

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://nomylo.ru/uplcv?utm_term=durga+sir+java+notes+pdf+download PDF link annotation
    • http://azbuka-d.ru/ckfinder/userfiles/files/zakakafilibutozepetud.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/mitokevavomolo.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/faxobukiwiw.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/rigabolividevit.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfe6c65bd---wirolojulupodogolot.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/32832732762.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b00ca99e1---79337979114.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607248076df3b---74912322866.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6625a90ad9---mivipelusadamew.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/326323391.pdfIn PDF document text
    • http://podarox.ru/public/files/lelawusafujudazane.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/baketigewofuziregeki.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/ed08f96b5b6e08faeb1d2bf479a41602/13988815976.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/cfb141c5530944ff54835b68181323a2/pubeferokofotirolav.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/25757901166.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/68686544315.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/41961004475.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/86387774818.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210523003259.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161034bf0a9f14---60189112194.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/57267818830.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f1a2bbb10---60196485445.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/33832534248.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/tevusan.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/5217583823.pdfIn 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_off0001d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED2B 21940 bytes
SHA-256: 5e7dacfaede921b13bc13e2733de295a572f4f8473f14d79c3db162e530399c1
font_02_sfnt_off00022767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22767 11056 bytes
SHA-256: 844d816e5acf6898196cd30d6d62fd04efde032f859b2f2edb14f0c719890967