Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf840b2e482dbc…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 22:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92c2349a21ef377115d0550cbdcafac7 SHA-1: f8cd89c4c7252cb5117fa3c9c8199ffbdfc660d6 SHA-256: 5daf840b2e482dbc6f34851ebd35fd9de18a322fd7f95ae197c82a5238d23072
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identify it as a link farm hosted on compromised WordPress sites, designed to redirect users to various PDF files. The presence of multiple external URIs and the nature of the hosting suggest a phishing or malware distribution campaign.

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02840d5ea---92131316146.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/2d9c6d400abd8c4a80a6ef79e30c54b7/57408715967.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/b3d99d8bbf78296943c15617394d57aa/34521000363.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26ae2d5cf5---vavawoxel.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/165bec24df8b744db13646c79fbbef22/vozofad.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e259113394---56869445367.pdf
    • https://digireg.cz/upload/88826767070.pdf
    • https://ajitcoatings.com/uploads/gipalope.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fotamafuvipu.pdf
    • http://flygarfield.net/userfiles/file/51466830622.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c83b345d1---wixadozilupimivijal.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16087d23a9da03---mesesewomoxijepidital.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608300b9c6196---febaxiwumip.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8efcd21157---sipezivulanoke.pdf
    • http://magicdiscoradio.hu/userfiles/file/zopifu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609f017078b08---kapajotibipone.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a02593a5d77---zujap.pdf
    • https://bajrahrs.com/userfiles/file/xenuvenalobiv.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d92edcb66dacd0ffe2036847f3e5596b/mepogomomuduviludojimawel.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2b53f294c07c0212d36cff9a30d4d99/fazerewavilu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=strategic+human+resource+management+examples
    • 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_off0000ebe8.bin
9e9ce9de0319aa81535a495a1d72cc7e9bc73529faa4ee43eeb6fc7684e9dfa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 11096 bytes
font_01_sfnt_off00010599.bin
19888c9da7f768dcd40cfbdf8e4376cc1295ee55fc060ff7b30ad5e6d426c181
pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 16396 bytes
font_02_sfnt_off00012fe4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 16792 bytes