Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c646aa132d3ca8…

MALICIOUS

PDF

109.4 KB Created: 2021-09-07 16:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b95dea9fd3d578151847042a7bdc254c SHA-1: 2a1194881d70134babece2c9d0b9f594d2f74400 SHA-256: 79c646aa132d3ca88d72c5d6d57e0afb3131dc92c212f992e99b0de8d746442a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and potentially malicious files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://pistant.ru/uplcv?utm_term=principes+de+radiologie+du+thorax+felson+pdf PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16087f11cd4ade---lowuzudedafekolel.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/55302140471.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/133ee31346a162c85f7baf0c1f900c93/17192353938.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vutilusorivajotafule.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a38935793d6---71803982076.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed6573cd9---gumobivosif.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/78803440844.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f53bec34fe---wafizulonowexoz.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a0389fbceed83190b3255b6661ca25f0/wexokokebisotedonobidudol.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/662f993cf5f1556ce135f23aebf4d867/23002404768.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/nuwegekupabipa.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ve2q5c8v0l8pm02u4sckt9qua2/pudidusirugabizozof.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/rinagipigusogix.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3c8906c1f7---somasijanufoxutilurifeji.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/61e668febda18003bf4d28892fa65154/fumid.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/wizavuruxujajimebotoxalu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3a64c262---67599157795.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac70f2695dd---waverojitowivovox.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/17352027854.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/cfe8b2656a2925645f8844e0a8552464/lelomaratawus.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/4692842944.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/nikobokimiga.pdfIn PDF document text
    • 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_off00013fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAB 11104 bytes
SHA-256: 023ca9ad66ceaab9b99c472e759a3dab7e4564cabcd7f2c96a4508f9b61d9b55
font_01_sfnt_off0001594c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1594C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001715e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1715E 21372 bytes
SHA-256: afad6f6087a4067c8ef1d571ee4e225e8e9c27a7ba96419f52c95de7b7eae9de

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