Malicious PDF — malware analysis report

Static analysis result for SHA-256 260c4870aeb3024b…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 03:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55f6d433bda92eb97b62ab5e0b014085 SHA-1: 4a59d916189b45d300034316bdb064138a572f4e SHA-256: 260c4870aeb3024b604afe2f7e733644ee4bd0b50d144592f3af5c51401a9012
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of multiple distinct hosts and UTM parameters suggests a coordinated effort to distribute malicious content.

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://oniceh.ru/uplcv?utm_term=toy+pinscher+for+sale
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/82090920595.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c07c38d3bef11477ff8cc24e9bc196/24973303644.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ahnmh6vo4em4kpvf6tu063s0fr/bikebefumusejibi.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9a6e5841---23282429858.pdf
    • http://nacyc.jp/Upload/file/degulozinusetin.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b0f560ed---95077995724.pdf
    • https://ooo-kenk.ru/userfiles/file/biwakidal.pdf
    • http://nordicaluminium.ru/userfiles/file/kawamasoraxowipumu.pdf
    • http://com123.vn/uploads/file/zowiraxusemogavepefikevuj.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f18268ec79---47830415684.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d8dbbfe59---disekinotelopalawubejuja.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/imh6ejt0sktv0pgmjqbd5cnrn9/14632193988.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c374f0b6e0---18469760183.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/ace17029325f27f378350b452d94bc11/xezow.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb15b96757---kapiruferupazel.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750144b6134---30246793132.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5665c652---webuzasesufewidimud.pdf
    • http://goref.ru/files/file/gojugesebimebowubowolupol.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/de13cd7d8c0166ed04c8da25a312cd84/92785075442.pdf
    • http://j1medical.com/uploaded/file/91906092283.pdf
    • http://paulsaperstein.com/userfiles/files/58098790217.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba3598eb3---99663460690.pdf
    • https://asiabiru.com/contents//files/74813383444.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b69bdf17d881a6f9964f691272b6359d/33019767240.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f44d.bin
67391a4f837deeb547aec99442901ec1656384d34206d4ae675e639c23a1fdad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 10556 bytes
font_01_sfnt_off00010c53.bin
af9df9b44235fb025d50c363cef76527d327b8b7cca44660832854185941acd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C53 17144 bytes
font_02_sfnt_off000138ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138CA 16792 bytes