Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be3de4af3edde4c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 01:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75bcba2a178f5c45c8b1a8df817c51f SHA-1: 8010d99986a9c1579bc1d4ce9312e55a852b700a SHA-256: 6be3de4af3edde4c4287a4115917191622c80370be6ce513ee1e25aa11ddc563
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The 'SE_DOWNLOAD_BUTTON' heuristic and the presence of 'utm_term' in one URL suggest a lure for users to click and download potentially malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://cructi.ru/uplcv?utm_term=call+of+duty+4+modern+warfare+download+utorrent
    • http://sirindhorn.net/upload/File/sejiridebizujizoxadegupo.pdf
    • http://agroanaliz.by/upload/editor/files/41338027079.pdf
    • http://xaydunglenguyen.vn/upload/files/1ca2e8.pdf
    • http://kkc1.org/htdocs/cljr/data/files/vulezelisaxizumago.pdf
    • https://weborder.cloud/userfiles/file///58487414215.pdf
    • http://skiflogistics.ru/userfiles/file/nokusiforiroti.pdf
    • https://kalitelivideoizle.com/resimler/files/kiwasunoxijisulufovaxeku.pdf
    • http://hangquangauto.com/files/20379601553.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e78d02733.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02daad227---mavupuxipefetafuwaniraje.pdf
    • https://mobilaide.com/upload/editor/file/mejomidedukevej.pdf
    • http://restavratorstvo.com/ckfinder/userfiles/files/buxoli.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d52f5b7441---65962197706.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613901dbeaba5---36195031134.pdf
    • http://sun-eko.eu/files/file/31997355618.pdf
    • https://casalindasbakery.com/ckfinder/userfiles/files/tonuwiteladexiga.pdf
    • http://acril.ru/ufiles/files/55476407390.pdf
    • http://majstrissmt.eu/www-data/file/69805393859.pdf
    • https://brianhigbielaw.com/UserFiles/file/51357512184.pdf
    • https://espiber.cl/images/uploadedimages/file/rebimitilitazavofagosose.pdf
    • https://brihat-group.com/assets/userfiles/files/31799808103.pdf
    • http://caythuocdangian.net/images/files/kunatavilivida.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_off0000ce55.bin
ac8b0324aae2fe300aa5000dd25d57594de78a3922e784e299b757a931438626		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 19804 bytes
font_01_sfnt_off00010265.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
font_02_sfnt_off00011a7c.bin
1a2ee70b663ae8835e6bbe4abfd809714f27b47581f86376617bde41791b7ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7C 10664 bytes

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