Malicious PDF — malware analysis report

Static analysis result for SHA-256 23609e6beecea307…

MALICIOUS

PDF

77.1 KB Created: 2021-06-25 12:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9772001ebc67e8192527b1e9386bb60 SHA-1: 661155f03fa60b0861b09c05a870d701ed06f310 SHA-256: 23609e6beecea30786cfcd7e38ad55a0fe929f0070cf7f753ba56f6663a0b87c
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into downloading further malicious content or revealing sensitive information. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://citadelcaralarms.com/userfiles/file/rivex.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/86141596945.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77f324e1f5---27439684728.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c6e3a6711a859d9b69c020221779427f/26029084256.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f85b95d2---68073165502.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e7dba807---24366916442.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97ad4b783---gisalutasosofo.pdf
    • https://iwnta.com/userfiles/file/66390594628.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/ljk72al0qltqtc09uhe5s0efn9/28101348090.pdf
    • http://adveotec.com/img/file/novetakibusafezobipetofa.pdf
    • https://arichaindia.com/userfiles/file/5355660150.pdf
    • https://pypconsultores.mx/userfiles/file/joxewokegaxevoba.pdf
    • https://festival.bg/fckeditorfiles/file/guxewefegisumapo.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be4b1a6e707---74998322190.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b5717a05---tutixarukewuvapukexu.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/459ueuf3up8vhhbvnalb1rfqjr/bunam.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v3gt4bcqlnui8etpuup0o2rhj4/xokeritoregazotapo.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9d8deffb---bajukutita.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=nicki+minaj+queen+download+album
    • 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_off0000c6ee.bin
fd87f6288039e778d9bfc8282f55b5bb626ebe627bfa23dc12ec9e5e0916196f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 10836 bytes
font_01_sfnt_off0000dfb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 16792 bytes
font_02_sfnt_off0000f7cb.bin
2adca1370bdd803144c8397c414cc3535426f56bbc49a76b5035069a9beb5717
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 17424 bytes