Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ed7617e2db1c21…

MALICIOUS

PDF

74.2 KB Created: 2021-09-07 19:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a35119d209b825201bf86358ad5c94e0 SHA-1: 1f04f354a12380217dfcad9442e552505f9f5f8a SHA-256: 04ed7617e2db1c2158e22b508e2e1ce8e4bc2a0bf5f179d665b4a0aa99f3be8b
156 Risk Score

Malware Insights

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

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, containing numerous links pointing to compromised WordPress upload storage and other disposable hosting sites. These links are likely designed to lure users to phishing pages or download further 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 http://ccforum.kr/uploads/file/1621458903.pdf In PDF document text
    • http://bettynblue.com/upload/fck_img/20210606/file/venexefokunofabuvune.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/acbd647703523965ae5566bc0eecd858/18921406311.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098597a80048---vofaxiduki.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/wajikunubiginofexirobikuz.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8a71b038f6bddae69a6a6050d7eb1643/18063555239.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14f6afcba---47294744979.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840917487c---82926176437.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/56610252319.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b284f37cd58---24292365294.pdfIn PDF document text
    • http://ezibra.pl/upload//file/36646235043.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/55904997280.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/labudiwevomonir.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746f5b0676c---nadonorokoduje.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kilifamulijo.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/vesigafatuzigositewoge.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/61579284127.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/66893430099.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/2171535038.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acbb07b1e3---37494248803.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3e8396b09df1ae17b4e536f358e60c11/wezegixagiwuluruzesademuf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e9f678b71f9ecd5f8c8bdc13b823d8c9/renogafominibafimu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/suvodedaxenikefakex.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210808075742.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d65fd7c292---ramefamefaripivemivubam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=geometric+probability+quiz+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_off0000bd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD56 17112 bytes
SHA-256: 308adcf51355c27c1033996b054fb7736b5b02b33c950e4fd6b4946d8df26bcf
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 11108 bytes
SHA-256: 6cabcd31619aa55aef522c9651356a868f16357c3cc5ba90c5b2d08d88036022

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