Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc72bf10ba3899a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 12:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 149bda50027b97778e4646ec6e81c30b SHA-1: eab86955775afd3f31f021b810fec88ed4b63413 SHA-256: 6fc72bf10ba3899acc4737636710e20d7ff5bba705fe8ba4aa66207699857002
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous links are consistent with a link farm designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=mandatory+injunction+under+cpc PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/j972o6htieo2gg21evc3vsi2vj/1547655955.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/zoludadexepekuvaresava.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/90069621822.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/391553763.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1623090634.pdfIn PDF document text
    • https://codecs.roimages/file/muforarikeletoxepeguxis.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2193f297d---natewunukipokemoja.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/16931071757.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hiospek6405mp4h1sjkirillp3/69533395424.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/77277d52e803de1eb52c030dde72d579/89564696522.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d859e4ac4---xojajubutalafokila.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bdda48acf03---86583495851.pdfIn PDF document text
    • http://edgecs.net/documents/9562115194.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/61007451876.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51d74c0ff---44362207787.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f97e109---fokevuxudipimun.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/30483714815.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa00687a23---99653503238.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607726cb5ed73---48409758445.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a3c09b5a31c13585660ba339722fffdb/zelisegefakis.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6f6e6e1e9a783cd0dbb6b1d814765d0b/41378991869.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/42310393137.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 10632 bytes
SHA-256: 2a535770e8f1ca9d7e6702a59d33fad7c7432637110130a785b8cd061f85f851
font_01_sfnt_off00010698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 17196 bytes
SHA-256: e98f096763809a2cd659dd38ab2230ab281ff4c010f7b1fb69a19fcb82a0ae3e

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