Malicious PDF — malware analysis report

Static analysis result for SHA-256 451263d29186ecc7…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 13:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d26ba32fd5ea986a324c41b88d7de6a6 SHA-1: f916340402226accdbc58f487f750c198e0d90ec SHA-256: 451263d29186ecc7ef68ec27a6534406aaff88735b7d20d74fb19265c3680e64
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress uploads, suggesting it's designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm nature is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b97a532d---jatavurefebamebirazo.pdf In PDF document text
    • http://potlista.com/file/files/pekuteludipida.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/71461227835.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mk1qj37urm1n774jm493ns44ba/787802996.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/71659318648.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a15257d0d---52772357906.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/lovezajolukid.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/gaveg.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/ruzivimunewuz.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/kuvigufifujibuw.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/38459431927.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/64019695650.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e0d123ed8---98311294377.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/55634610387.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/64858246726.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66586692191.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/71629127416.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/zewesidavef.pdfIn PDF document text
    • http://tzsunup.com/upload/29679583864.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/13472674564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+play+ringtone+in+android+programmaticallyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 10880 bytes
SHA-256: e7bf4b355af7735747649a6069795c62e434abe958ac9347951218d041c794bf
font_01_sfnt_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 18168 bytes
SHA-256: 5171688ecddbdd6ca2af622eac1339cd4ac7fae835dbaa82a4d6560281044e1f
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1