Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde241c7cf77dc61…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 09:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 748b32ce1b65901fae1a3d8d79d5f793 SHA-1: 346776d577aed6a148e45b2e26342aa2c9cfe8ab SHA-256: cde241c7cf77dc618d75dafe87074be8046d1b363b90d4670c9b09aaf08114ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and are designed as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/91e110f1ada3252ebc6b276f9174dfad/tobogagiwus.pdf
    • http://files.ibiza-ferien.de/file/22808004183.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8081a4ebfc---82756062874.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2d5f6cc79f9e2c6f4f84e7f852587494/nimetezetesatagowu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bdai5steh7nhqsghi64l1956q8/36774831851.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/8203a547a8d7d1917b056c90175902ae/meselanogofodek.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16241260310689.pdf
    • http://ahchala.com/img/file/kumisowipopowuwofisupepu.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/7nk7dqo4ld84erk2m8cv7frdta/86203079010.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bvbf0pcluldjphem22fnaevou4/74390160424.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/1b3c9f0cc4bdc6cc5c17a8011f53f9a4/22019832150.pdf
    • http://ahxxzx.com/userfiles/202105/file/keminazodepe.pdf
    • http://surtek.biz/image/files/20150119_012945.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96b42df20---29584517374.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a38331aca8a---kazupejilamulusimamod.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/3qnda20ko2f9dt2jfcupn40sq2/doletiwogaxa.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609948a31bcb3---visaxidixeki.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf8990b407---87641527191.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/baea284b4e051b50dcc22af766766e9a/26645903142.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94a5cef54e---vijowofevekuwude.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/fujinumiloragakixusigala.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/4qbuo1hojng2orfgau93ds4qo5/favomitafonikozume.pdf
    • https://armagedonspedycja.pl/files/file/23069084710.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b434vdmusbulfadrccks0ftru6/36935001516.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=thrips+on+philodendron
    • 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_off0000f656.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16792 bytes
font_01_sfnt_off00010e6d.bin
36f9ff90fd298abf5bcf0b73e8f8f6d4a50f1bb291bf5e5ebf12fd9da56eba55
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 10192 bytes
font_02_sfnt_off00012516.bin
e90ffb02ff66450e2141377f25542c129126d68c5617939745bca1a181e8087f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 19304 bytes