Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea476ca3ab953b4…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 21:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a99ba52bcba254de2a3f4a22333a942 SHA-1: 7dc23c8afcc29a9e74dce771036c61ba5353d8f3 SHA-256: fea476ca3ab953b41547d9fbd628aad228d05859d22e31d313e4fbf5248f2bee
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the ability to determine the exact payload or specific attack vector beyond the link farm.

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://www.cbs-emballages.com/upload/file/vimon.pdf In PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/vapurugobamifowaketaruru.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ee1d25e1---togijifopebibikag.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614021cf76d1d---89962366056.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/texapakoretevejelig.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/vanases.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142535b8a4aa---52712082450.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rimepavotoxebusojudiw.pdfIn PDF document text
    • http://nanopena.cz/upload/file/29445308181.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/foloba.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/lowubesoxumaj.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/pinajigaguvawosesusijiba.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/76498756091.pdfIn PDF document text
    • https://ksboutlet.com/file/files/rarisuxanufiwugosirumex.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/10883134133.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/71816233599.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/paketusorevugiforobi.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/dozomafixuxuzuvote.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c212bc8702---25523433566.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/binupatipowerekameginole.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/gorulitobudixilajinofixol.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/75597997310.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/84785606213.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2vsb2t0bai55k4ccisi7fngcmn/zizoladasiterapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=txd+tool+apk+gratisPDF 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_off0000c750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC750 10488 bytes
SHA-256: 1b6036e6d064c34c1356bb60b7f125dcb937fcdea978dc7f902fcd35875c323a
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 17152 bytes
SHA-256: d4d3133534469d9f793dba1fb2ab6efac48f7b84a73e496562870957978e75b3
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1