Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fb81df43a6edda…

MALICIOUS

PDF

88.4 KB Created: 2021-06-30 04:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f1a4506743fcc2a4a1e4206e8e8f91e SHA-1: 3eb9af5afe562d209bc7ebff3f26109854bfdcc7 SHA-256: f2fb81df43a6edda18b2042e397fd88b8fc08651ebb95e3d25cc7877d7d9bb42
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. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing content hosted on these external sites.

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://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/cb7c5b06ade74075245d45b37bee064c/95131724513.pdf In PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/7ee563e97ffd645c8c4103295233e359/42637651059.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/sowuxizena.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071df17cd90c---kepamab.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/mazagupivowemebe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/94b96219e0e1675451f7469ee6e804eb/sirizijabizirozolumovim.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3d89de3e4---jasotumobojarosulala.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6688ed22---86224084995.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zuruguxate.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/aba55042cf7d06fe23571fb82be2ad48/70085303139.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/49d9f16dbce05935e07011f8c55f1fc1/71964229903.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608938f8a2c35---83533231322.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/beripofaril.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081b14b45fe4---gibolejikuvurowab.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/suxelufuzewelu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/sopupuko.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ccf19beba28535ffe1a829c24ec9a244/11748830277.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/20342785331.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba317dbc8e70cee6244256d7680a682e/45064632034.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/63371528084.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094100595705---gusimivavu.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/19628368293.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bc978b81ab7---53188424210.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/tazelelilomifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=side+effects+of+mmr+and+varicella+vaccinePDF 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_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16576 bytes
SHA-256: f08edb6f01361d473f0cdf8cb03f673b2f6fd4b9d6e2c0b85e3baf186c0df56e
font_01_sfnt_off0001237f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237F 10776 bytes
SHA-256: 835e4ab54b906e782b3456c3eef742e4f3d85ec7856e47a24b48092468a5d8ae
font_02_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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