Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8343848318d2e8…

MALICIOUS

PDF

92.9 KB Created: 2021-09-09 01:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25e2078b1a8312b145a8d8e5e4c2d4b2 SHA-1: a0a589e6c3b099f0036455a7fd12e60a2cc9c285 SHA-256: 2c8343848318d2e8c37429976c2d3ff40d8c698fcdbc6684d503f7996920ef78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://salonorganica.ru/upload/files/posizimigarixiwilemu.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130440c8d617---sokokefikejorizelapuko.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393582da4b6---89442888148.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/36922742574.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905005252.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/76342289241.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/datuwebexariridiwis.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/33879968894.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/28235950331.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/16310881261.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9fd48b09b85e3358d9dcefffbc4abbe2/zejumovarigulokitozenati.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///puradaxujoxotodevaner.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/damakukubu.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137703f69c59---pixek.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/raxixinogatelugadesenuku.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/80789837380.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/54424265893.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/71881274396.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/gaveda.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/1793127759.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/55289190182.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/31503635536.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903140000_8yszud.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/vizubixetew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+live+photo+a+lock+screenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 19876 bytes
SHA-256: 9d50bd33465d89839013e09d8b2ea18e3378ea26596c7cd3d9defe73b56c611d
font_01_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13085 18032 bytes
SHA-256: f9cde1762e1eaa63cd6532be08c9113e182653aa0a637193493751a50a95e3bb
font_03_sfnt_off00014c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6C 10872 bytes
SHA-256: 831e0d469d218a210b0c7be00d4f1198db87306776e9690e7e463d1053a5e851

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