Malicious PDF — malware analysis report

Static analysis result for SHA-256 2542f1fc14843a32…

MALICIOUS

PDF

73.7 KB Created: 2021-08-18 00:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2927120adeb82188ce8c8ba427a8819d SHA-1: 5ba4ff71051f036483330ed1c7448de02b33cb1d SHA-256: 2542f1fc14843a32d29117d8f148ad6fe1c7cdb3f75e1694988a91a1990f5663
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alatheir.com/atheirwsfiles/file/terakasudikufitamal.pdf In PDF document text
    • http://righetti-ticozzi.it/userfiles/files/18042796208.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a918af0b3---vabilituxemokezupi.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/18857551359.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/43175211603.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/dudarirugonatefudoz.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/26755361724.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01fb040e14---forajopesafimizalufisiwok.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/qsdt6u1drtmriom3cm4fmt77g1/59529074762.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ac9tp3dgck9779smkhvqcr1u73/miniwovepejopag.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/23998903435.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/58475042949.pdfIn PDF document text
    • https://roc.mn/uploads/files/xijujotefofefejuvizuw.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/69603335734.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/2387048088.pdfIn PDF document text
    • http://livilgirls.com/files/8210869230.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/90519423243.pdfIn PDF document text
    • https://bselink.com/userfiles/file/vorinuriseluwozabuvetu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aee604e6a---raxatasiduvidonugo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b496f4c8---digixilawuzowe.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/29297537563.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/234c1f98c98dc9e190bfb476eba6a576/guwonugusodorugofemuka.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ir9m5mtv70ft0rrfr584erhlo4/gibasejonize.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1611179f8b65bb---wenirikenubiladodow.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c1e92fdc1---wovepovumoferonejevegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ejercicios+operaciones+combinadas+con+potencias+2+eso+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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 11108 bytes
SHA-256: 2c200604e41cdde19abb8085077ba3756b9d61aada59e9621ef5d3594a8aa927
font_01_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 16932 bytes
SHA-256: 3d6462289b976fcfec5c8c28f8eb6f0acc83ef5141b7dbae2d77d32765bbfb7f
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1