Malicious PDF — malware analysis report

Static analysis result for SHA-256 598b9c504a821bca…

MALICIOUS

PDF

113.2 KB Created: 2021-07-18 15:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a85bf65c0c1644b72ca4a05d5c5c4e7 SHA-1: 19b8d69f036d4ff5ff66e784b8624be507e2eff0 SHA-256: 598b9c504a821bcafe92e456431481ba1124684d61df7e6375dbafd450be93d7
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2b82c1b1a6203d029714e97f591e2315/fogajogazezuwovevukixiki.pdf In PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/76091311614.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fef69ea1---31457220916.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/30/67986703855.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/28036887518.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/f8b1fee91471edb339e528896f6a0345/93097348532.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/22383193478.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62714601929.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/zaduromed.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/tebumilarunixogemisoga.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdehigr2h8f67e2lip09v32ha7/22658815594.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/s6qqp1n3lh8d8ecnilbr0023i1/69060921486.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc752c9a013---litozizomoxiwiraxapaxo.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/jamuwanameg.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/verefo.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3k0f3828q4a530okmpsrnbs94/zoxuz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160806fb675a39---9432972819.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/jafimoluruwuguxatemoboxeg.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8a74d3c9---gabatozotuwa.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/24637504648.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6d3ba3bc---21331668077.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b231aa6ce4165163c5c47c88c996b20/tovotafofutevujejodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=composition+of+connective+tissuePDF 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_off000156e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF3 19264 bytes
SHA-256: ba4d433bf5061aa0cb153c521ed3c683356730a2abb8b769331626d4ea19bde0
font_02_sfnt_off00019fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA1 10528 bytes
SHA-256: 5684a7b7a9b6c023b7bd547d34c334098e1ee6fab9153d650a1ff781134da0fb

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