Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a99eaf7360cfc0…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 02:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8f4e474b4e817b718fbe6f7b8031d3a SHA-1: d423ec101e2754fc861d1cadbd3f5c355382ab08 SHA-256: 67a99eaf7360cfc09ac045dd1e5db860e643e2bd32dc56047496f33de4c07c14
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns. The document body is heavily obfuscated and unreadable, indicating a deliberate attempt to hide its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=some+any+much+many+a+lot+of+exercises+pdf PDF link annotation
    • http://files.ibiza-ferien.de/file/41788333944.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/20156538451.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/34479384874.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/zuwilinunovatafojapuzalo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7441a9a20---87981459517.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/62167656326.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/mutulafenitixutakafomok.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/93014ee6d783d688e7e4d40d4dcc6f87/teropuzalup.pdfIn PDF document text
    • https://polandpools.com/contents//files/28730249279.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e2eb3485---95679656875.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/38c3fae6f17a13d4ccfc2372bed2f269/talifuwasokumovevomogaj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dee884500---vefijevawegitani.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/585e88e30f6732d364f796bf55bbb994/19344126731.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608100f64d94c---69435455064.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f1fb06210a5422180575e13d7fe2ec14/bulapaxapipofen.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/xodigamojireduvegu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f822e7c1bd---sobadatu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a4d1f830b30b4ba2bc6128439b3e8ac0/bitiribaviloforeberuk.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb3a9da21---4856830466.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/tekuzibatap.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072735149291---147417455.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/14148782907.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe3ee30c0---tojolivibafiled.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/357acac52f77f8db14b80fc5e1987964/27892404303.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_off0000cbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 11276 bytes
SHA-256: bf308848c39f8e1e1d0b7dd8d9cda22ed314f150de2d418c60b38c87ebb47a46
font_02_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 17376 bytes
SHA-256: 945b1dd11357953756f5985fcabda082c4f4174dad9f7452c2140fff9a0256d8

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