Malicious PDF — malware analysis report

Static analysis result for SHA-256 4904d6f9ff864a9d…

MALICIOUS

PDF

88.1 KB Created: 2021-09-04 20:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9edce678f13c7b926444428e6f2c5ef1 SHA-1: c9dd9a52817f4943bcd5b25ef7f64e96e52ec9a1 SHA-256: 4904d6f9ff864a9d34e75bcfcbba1918efce38b430663c6bb3c03555867559c5
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/51f904d1b68dffd005873dd143fa94a6/827429179.pdf
    • http://puntolinea.org/userfiles/files/betiz.pdf
    • http://orkoien.com/userfiles/files/32478801223.pdf
    • https://watertorens.nl/userfiles/file/49391466259.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/99655538986.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dc3a5a356e9f34de82411ec102f23d4/lunudetekegin.pdf
    • https://gbp.dropship-online.com/userfiles/files/6394295265.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f6f82f23---wexamulekivovusekojes.pdf
    • https://blugarden.eu/file/66153442519.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad8f14c82---jasaxo.pdf
    • http://bomtvplus.com/data/board/file/20210530132920.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/63c9a891671b5b80a86d21fbabae207b/rabizoputumofiwosemimov.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608483c71940c---ritidi.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fd55ae546131fc37e22cc5429a28458/80866187139.pdf
    • https://pmeds.us/userfiles/file/xamowitegobiludebupo.pdf
    • http://studiopignotti.it/userfiles/files/84307017723.pdf
    • http://travellightnepal.com/userfiles/file/43894336328.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/be649dd617b79b3c406a09f2a73e2ed8/girodoluwegadog.pdf
    • https://renebeumer.nl/userfiles/file/bexuwuratededararaw.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081593702e4c---mozetavagulabete.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/rutojebopigirufokibufuped.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607158b40c20e---dowuwuxojewido.pdf
    • https://pilot-nav.com/ckfinder/userfiles/files/jerilu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=a+poesia+epica+de+camoes+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_off0000f017.bin
b86efea678773fcd7d32ec43f202963b76de6f77e59d0ee2c1b879934f1c4e90
pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10412 bytes
font_01_sfnt_off000107b5.bin
f6d38fc0e6311496bb632db0494d900577f4a1efbd99eb6828de8d3d02d46a06
pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 19628 bytes
font_02_sfnt_off00013add.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADD 16792 bytes