Malicious PDF — malware analysis report

Static analysis result for SHA-256 9902a9f136bf358b…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 16:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 655372f33db3374ab3685e0975f77da5 SHA-1: 9a5030b46429f890d039abb912361e7665a4cdf6 SHA-256: 9902a9f136bf358b29389c1c04c7e718def5610888cbcd2af91d76c1b9b93c49
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or facilitating phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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
  • 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://baxsporthorses.nl/userfiles/file/rovozadixomunaju.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a9fbd83dbbc95b0857d8e44a8d8f7558/87141929367.pdf
    • https://egf.tw/test2/images/file/30488828502.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2386c619dd77ad675df273b1d6c7122a/pobobaw.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f27c68d81d3474a7492c9b5a79c5a53a/4861347398.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0f181f4d60b3c336e05db647ae2a4e70/86737022537.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cue9q2aqsvmsgnjkg2d2nade62/mimekubewigijulirulisi.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/semevurajusabugibedota.pdf
    • http://oresteruggiero.com/userfiles/files/96840787865.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde8fdc496---setesizeguvov.pdf
    • http://dolphinkorea.com/files/files/pidasowisijidoto.pdf
    • http://dolphinegypt.net/userfiles/file/2011605605.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6292d841d13eb8505f2cab704d0b4c71/davasofavat.pdf
    • http://huerural.com/uploads/image/files/78169717883.pdf
    • https://rmp-familienanzeigen.de/cms/files/60471350094.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/2lntbsu7bdtbi52hkqma6tmub1/gupegegamirer.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/ca89c94e82d0d638bd4d32b385e024a8/xigekatizevesapabonetufut.pdf
    • https://ewt.cz/res/file/37173677629.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0415ab3f2---73803027742.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qte3cku7jc76959leg5tpktg7j/bowedani.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ch88eb4iejo358ngghuvcdbj36/jipuxexaruferigokexe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=resignation+letter+to+employer
    • 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_off0000e5d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
font_01_sfnt_off0000fde8.bin
4f178c798f4856e56e0044301c0d2e6fee975c1170bbe968d9a2ffb205503925
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 17544 bytes
font_02_sfnt_off00012b64.bin
1c9e5e9520b59b8f1845cd46eb478a70a6332224f3e6870b1fa2b230b91f3d09
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B64 10756 bytes