Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b86c69f0333479…

MALICIOUS

PDF

96.0 KB Created: 2021-07-03 11:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 628c2067f7739f64c74fbe19a984ee24 SHA-1: 1b4855844890b2f45b20f4aa84f3d720ced95ca5 SHA-256: 42b86c69f033347976cfd578156273860fec5786e2e627457e7dc31f7b20a95a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=combined+cycle+gas+power+plant+pdf PDF link annotation
    • https://hogies.com/includes/template/uploads/file/kiwigoru.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/23320841764.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/befebixav.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8qp59fif55n8j6a9m2vgc7lujn/75387425900.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/nftmrdghob3ifg6rfnu99513lu/bawosokibiwoburenitajul.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e28231934d5aaa80989a861805455b90/74662324003.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210620_6B8BB71FB3B55324.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/404a1cff9eb5bccf18aac32f4e3f27eb/69227518283.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d03c836c5---87785014165.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d597abe42---botubinodigadat.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/71153177430.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/36149735775.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/makexoxovavovanasuz.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/30251423054.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1sr86pq40g1hre6jn8t4k24ddk/32583355305.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc7b4b580---ranagoxexibela.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a373609a710---33010417013.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/96efb79a39e573d9013ac75e8f6b05a4/jexizojinega.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ab6d7d27---migedinutanewikekevo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/3peclde5g4gc6r5f0dgsan0lr0/72878526193.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fojumuka.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/73122009260.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7l14sq871aomlv6rva7dua2ah7/zexajosuxadaxox.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_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 11332 bytes
SHA-256: ea6e4f2a4416366ab11fa9a3dc016dc4007469869639608ee00ccd812852cf8e
font_01_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001451d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1451D 17400 bytes
SHA-256: 0a7e1be17125e1fb50e21aa77c7d4b96582b2a4519319d4af2c2a1dc31fb2c3f

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