Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c60a46b6f010a56…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 02:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6ab32535fb837c55f946c9cf826f0d3 SHA-1: 49017498c4122a8c943f0f5c6411da7c5271debc SHA-256: 1c60a46b6f010a56bda8dbec14665c219e182d3c8e49dc2bf93a7ca2e02488c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dorp.pl/userfiles/files/55156071990.pdf In PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607676f591b98---61600565343.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/lojodugeravazikov.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44742845854.pdfIn PDF document text
    • http://beateromer.com/bilder/file/41431183832.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/43345480310.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/rolokawidevuxo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/4b0bde162445538655cb5d34dde58b07/sisemozudujofenaduzok.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/97121822092.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/digulisum.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/rizarebaw.pdfIn PDF document text
    • http://netflor.pl/upload/File/83998383696.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083362aae5fc---nitufusuxutajumatizug.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/ag8fc7chs3cfp945cn9k7468ki/wemajojusonigazigizuxor.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bb632b5a6dc6bc4fceb162f4a879a92d/19705238231.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hp0kv3jbjc20bgm9rmfq6uarg1/87026164061.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1529dd913---zefuredidimelawosogotokop.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/fd3e9ed9a3361c28235edcc879df38fc/nogekujadotopekenowiwogew.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/5cf351c6ffd18ab69ef8d8fd10c0e547/58688437494.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/meman.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/duxaz.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/fomirotudobo.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b4494eef71078e48f143e7287ca76c8d/rilufafumudalura.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/93684068897.pdfIn PDF document text
    • https://bonacorsi.it/file/kosonajekojigobafesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=manual+nespresso+inissia+pdfPDF link annotation
    • 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_off0000cd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 19152 bytes
SHA-256: 13613e2440b4bb31b99e2a33710609dcdbef756541cbae35bfd42d13f4e55031
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 10484 bytes
SHA-256: 8ba0603750ffdbbe8466e636b80ece0cf3ace3bf26892548c54e44abbac7a802

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