Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c5196f5c539608…

MALICIOUS

PDF

84.1 KB Created: 2021-07-17 21:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3b07650a25f2f83888ea15ac5b091e6 SHA-1: a01a172066148243aae3df88313d01980ea51131 SHA-256: d9c5196f5c539608dfb5436bbaf1c1c1a9a71bda6e64eb60f1da292e1e72ddd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous distinct hosts, many of which are compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary goal appears to be redirecting users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/70d1add5d5f38041146aabf6a04dffc0/19484869717.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3514f185f---82385317294.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/e70vrm6ucqsrkhe8e53k7vb49n/6951868909.pdf
    • https://damsindia.org/admin/uploads/file/dozuvin.pdf
    • http://grabnerestriche.at/piguvolujovugapiraj.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hathehnjlhqhq2or3ti97udbeb/duzivusekevuripuzawafar.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f90b11a505534f1d5ab06dfd40daca3/46387412660.pdf
    • http://s-moonlight.com/CKEdit/upload/files/nozokazemeg.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b13764b82fc---wewin.pdf
    • https://betalinktech.com/blmedia/file/85095512970.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607649b57c318---37581728544.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c559125f85---tipaxabuwepaze.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/62805074296.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/20v2fp9pnio9gfmcv4dbcp5pr4/34659363776.pdf
    • https://akproauto.net/nbloom/fckuploads/file/biroguzozigupad.pdf
    • http://caopump.com/admin/userfiles/file/75391670981.pdf
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/48b572999610bd6e53dd183bcc8cc128/bunasadufegum.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/6d268928e1b7aee399025cb2e9de6919/jonitugixilesuda.pdf
    • https://licorne-hotel-restaurant.com/userfiles/file/zopibezebeguxakula.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/b619441e59361351ef28df685b956881/5969900308.pdf
    • https://raptiherbal.com/ckfinder/userfiles/files/58895877908.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/b02dcefb5f623dd3844d69fbe3f5b8ac/79310843884.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gozubasa.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3a4c1876a---wujibaju.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc29db3cad5---ravipa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+happens+to+water+in+an+isotonic+solution
    • 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_off0000e62c.bin
99f48c7ba23f21323e9f41121ac72464f638e8af74816d6d4d30dea98b151e39
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 16872 bytes
font_01_sfnt_off0001125a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 16792 bytes
font_02_sfnt_off00012a71.bin
e685e0bc2c9a41e31fccb76856a9e84e1d9e6dc416ce02eaed274a14e4776405
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 10648 bytes