Malicious PDF — malware analysis report

Static analysis result for SHA-256 f69c04ff8c39835a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bbae4a18cd4a448e23442f9c5f68cc33 SHA-1: 901e0c66f01856ac039e265c1d02db1e7647d646 SHA-256: f69c04ff8c39835adc32adddac6c5d57b99e967d4114ce7a3188f14903e56341
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of multiple external URIs and link farm characteristics strongly suggests an attempt to lure users into clicking malicious 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 https://craft-personal.de/userfiles/file/31964743601.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/953ef7bbaf384ef4b04336bc71406da0/96636752295.pdfIn PDF document text
    • http://rafaelokazakov.com/file/34114935721.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee22604fd10---jefiturabowiwogupaxozi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/60a4cf2c28bb895aabcff37656849192/pesewasinakurata.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161169cd0f0b41---10962374951.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/67846968862.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/14224842713.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114cb3fe3347---lojuvasesujaxas.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cbb7f52b8ed83e64b9880a0ca45dc49e/vovaduguxuzudopelatuvutas.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5d0f49b28bebf1362d6bfc0dfc624471/porolarulure.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/19125041375.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/87645936681.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/114137fe24f9e476ad687a1daf40579a/zubusabozosuxosixivivi.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/ramasageler.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/68796955883.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/10747785384.pdfIn PDF document text
    • http://uco-kampen.com/media/files/85786193047.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/75374468676.pdfIn PDF document text
    • http://inncredel.com/uploads/44365101906.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/newowijapopefijuwat.pdfIn PDF document text
    • http://industra.sk/userfiles/file/35541806983.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/53118hs84jbr4ro2an8dccghde/pujojiralewujovolopakulig.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095712f94609---99366649282.pdfIn PDF document text
    • https://fuoriscena.eu/file/vebusiduwesabomisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=theories+of+language+development+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_off0000c63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63F 16040 bytes
SHA-256: ace7f2a9e9a10af93f24cc1c79797c33b9d2dc4ec520bc038fe730f63d3d05a5
font_01_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 11076 bytes
SHA-256: ed1fdcfd9f52359cffa3be86fe2c689cb63414d154e9d892db00befa50348673
font_02_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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