Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac33778c3bcff5b8…

MALICIOUS

PDF

79.9 KB Created: 2021-06-25 16:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 335f082c1d74533850639e81b1de8bc0 SHA-1: 53a60ad9e15e96bbc4ca93a569e0a990da2e5539 SHA-256: ac33778c3bcff5b8df54b28ea828087a037dbfb264059d4384a0040a6784d849
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=night+terrors+ages PDF link annotation
    • http://hurtmar.pl/Upload/file/79565527323.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/825262acb3e796a33ca4c087006f2465/11370024833.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078e27860112---wunibul.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077dbc015ff9---gajumura.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/pawadapuvoribisanavakugev.pdfIn PDF document text
    • https://kopari.hu/files/file/24386329836.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/jiluxetegoni.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607caa115ffd8---63147504356.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91050691679.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/da7f3b546a966c7607d3ff967240b6c6/fufawuxobomepotowu.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/35068578300.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f5fdac603cc6f6d7f24b807223242b87/57319363983.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/gebivipizanirip.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/3147153350.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/14474798209.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2dda0c6d1bae07424d7f5c92aa17edd0/vevopuforumozevog.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10216 bytes
SHA-256: e71ed15ed0c5542e863046ae575634ebc267c41132b6261893310f9f498c9ccc

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