Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bdfa117df79596…

MALICIOUS

PDF

70.4 KB Created: 2021-09-21 15:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b373be28a08631e8b352e3a26be322f SHA-1: 8032788c147ee5a78e8f3ccdf71281a9a0263bd4 SHA-256: 14bdfa117df795965ae7781128a232004cf912ad6c05505caf0947cd9cf3fa50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://wastran.ru/uplcv?utm_term=a+quiet+place+1+watch+online
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614115d08d551---28999020596.pdf
    • http://carbonelite.ru/file/56276609614.pdf
    • http://cmtl.in/uploads/userfiles/file/file/18793124301.pdf
    • http://rollfactorytogo.com/uploads/files/10020979556.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/161491deceff5f---80118576238.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/48897577230.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16148b1080fd0a---luxotinibakikejilupef.pdf
    • http://studiofranzoni.eu/userfiles/files/wavuko.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/70053458142.pdf
    • http://d2dgroup.net/upload/files/siravesewazotikinojuzapos.pdf
    • http://ylpqzl.com/ckfinder/userfiles/files/gaxegetixaxazugelulo.pdf
    • http://beerskiboot.de/img/upload/file/lesalolexunosolokabuna.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6564cd2c8fca50c4bbbac9653c8cf866/vunefazaminiw.pdf
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pokusa.pdf
    • https://heureka-cz.eu/files/34840956957.pdf
    • http://utcsp2.rustyramone.com/uploads/files/wipusalotuf.pdf
    • https://dunaweb.co/bg_image/files/23952534962.pdf
    • https://zerling.eu/nico/images/files/rejat.pdf
    • http://oecschool.com/userfiles/file/muzaralorepibeganul.pdf
    • http://gndpta.eu/news_objects/files/xilugavelidomasujukibusom.pdf
    • http://yule-sign.com/upload/editor/file/20210916060620.pdf
    • https://www.karelo.com/uploads/File/nalemidukugazapolez.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_off0000b14a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB14A 16792 bytes
font_01_sfnt_off0000c961.bin
4784294ea5d691bb84218b04d1aef1aefc56f348494135994d5f0f4d03f1311b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 10568 bytes
font_02_sfnt_off0000e187.bin
eff9134657c2c52792af2ca6ea30c8c8bd41b35a40cb308aa5e2405a90c14577		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 16488 bytes

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