Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f7a673ac99b9ee…

MALICIOUS

PDF

89.5 KB Created: 2021-08-14 06:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62bd333f27877f473d8b2ca581678b42 SHA-1: 014cc52e93ea4b596b854194a1d68f65de293fac SHA-256: c0f7a673ac99b9eefa056dbb9eb217a168ffcece0e90dced5febe584b8dbbb36
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://j-club.eu/userfiles/file/33296014290.pdf In PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/pnmb7o1sa536eigrqlbf8r6ol9/92443165856.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5jfa4s7j6li0442cdh9es6c050/total.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/33173752176.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/sutinozi.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/74501535809.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tofuxabemozuzafijirod.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/bcfeff829aec449238005f71c8dec8d3/wasagisovijotimuvosivit.pdfIn PDF document text
    • https://taperagi.com/contents//files/25364448615.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/kubujevekofokeguwixiwe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/19484241c1df81f29e53d494983ab1df/29910974357.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e3abd75aa84b1c1b7343dcd1d01d5916/18043155842.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fc7u64tm7la8ddjr0r2fmk2cmj/toxigokuga.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/66833587216.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jidusarunovewivazevo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7c7d3a35---89952598149.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/54102407837.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wurek.pdfIn PDF document text
    • https://datajournonepal.org/files/xivivoxekumanativuwu.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/kevonudosepoxabijesogini.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1859a288c---satodefonobevob.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810486ba7e2---xakedu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/70cl5r1c03qeaue3o6il84q4s8/sofuximoguvedasagud.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/14966038946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=advanced+cardiovascular+life+support+%28acls%29+provider+manual+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_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 11084 bytes
SHA-256: f819889a99fd9d6eeb97112f2160f198bf11091c9862cb869cfd2f8fe852d49d
font_01_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 17168 bytes
SHA-256: fe23d7c29dd0185ccc344abd3e53138c4c12a29dfcca6c23a42c6d2c585af4a0
font_02_sfnt_off00013fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1