Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8c10dc7620425b…

MALICIOUS

PDF

247.1 KB Created: 2021-07-07 17:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 876b880f90b9268ebb564497394464e3 SHA-1: 2bf44fa55c03484277cb630d1ab0ebfce2735489 SHA-256: 0b8c10dc7620425b3821f4123e05987a01f5409606e81411e491b219183c5015
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

Heuristics 5

  • 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.
  • 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://karmand24.ir/basefile/ehotel724ir/files/42518538311.pdf
    • http://jtipartner.com/ckfinder/userfiles/files/sulezokavewuvupebapitola.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf00d82a6a---lalirukepesugowumewi.pdf
    • http://world-green-hope.com/uploads/files/godigonopoliwesawuvenomut.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7239fab2---pojulivutapiwigijoxapejer.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a196d0aed31---12657520128.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3f7998904---14595595635.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b997a1d8dc1---80124927607.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2acef116e---lijababarugopujage.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefdb3a7ea---dunudewin.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/520ebc8cede88ea5d7d4de3eef77bf18/37733486605.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/4slukbvlh64b0tgle3u8e50c02/41482973463.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/75bf5b9f8a52f5a963bdbccbea768cc2/82124279231.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3222546061---67348918169.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bece0fa94---kawapofinezami.pdf
    • https://telenovella-bg.com/files/25779542070.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607793f0011de---kekanixadosepe.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s7388ho5upar4v97178mc5vep3/tedelabiwamomekawug.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4d3854b---dofoxovikazemiruton.pdf
    • http://ipllaser.in/uploads/rusipulufepilokiru.pdf
    • http://absolutelyneon.com/userfiles/file/xosanok.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b68d4706---86389314749.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/83fsrelnipaag1jjkjvq0tg5k5/92200908130.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dianna+agron+leaving+glee
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000356bd.bin
3683694adae8ad76703f71da5e5d8c859a363a859edb9d422bd5b0d5bae0e40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x356BD 19648 bytes
font_01_sfnt_off00038a10.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x38A10 16792 bytes
font_02_sfnt_off0003a227.bin
613109f099d430feb3d7a1feba8c92e359bdf2d121f370995236327c628bc960
pdf-font-stream PDF embedded font (sfnt) at offset 0x3A227 10084 bytes
font_03_sfnt_off0003b8ae.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
pdf-font-stream PDF embedded font (sfnt) at offset 0x3B8AE 16092 bytes