Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46d2f296c7bb1cc…

MALICIOUS

PDF

91.5 KB Created: 2021-08-19 15:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b476e6f1970ca43032e20261b1d1dc7 SHA-1: ec27f23acb1bd4de8c93878f0615451d095ca7eb SHA-256: c46d2f296c7bb1cc2b0dcdc928ca1b4bd74b356a2e18ca67898a83a3c5e715f3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6123

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huichem.com/ckfinder/userfiles/files/lajuliraferepitiki.pdf In PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/kezotexegarigapujes.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210629233842.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/kdeet75aret7fbojkggo3l81cs/33249414553.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/1216816885.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085d957c7f22---zatuwukakufisigodatipivog.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/tukijavubodigofuj.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee7a85015---80800053344.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b285bc432ed---zoxuretimokovet.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/41eb5u6cenmq6032lqm6htl0lj/77245920988.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/84589449226.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/rijidenegopafexurodunikop.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/guwomarikizaxobu.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/satazapi.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvtj4n3tkjjgqm8d1s9oh5lv6p/56025524929.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/96555604581.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/repimup.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde36b15acf---rogisozosanixaropidej.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1d9e0de0d30314b44c8f14dd1abd50ab/velubudem.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zidarafed.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/boperufefinumi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xawik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=obeb+okek+soru+%C3%A7%C3%B6z%C3%BCmleri+pdfPDF 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_off00011477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8E 11316 bytes
SHA-256: 8c9405c612d68e05e2950930806f288680438537ad283516297d4ca746629dff

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