Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d8d8ca101a5490…

MALICIOUS

PDF

68.2 KB Created: 2021-09-12 21:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc3719bb3e8952f1772db77e4f64836c SHA-1: 403cd6d31419241ed56719d97cbd0eca138e8579 SHA-256: 08d8d8ca101a5490f32700a599bdccbc484ce704b2bed0fe1d942af61cd29ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to various external websites. Several of these URLs point to compromised CMS upload directories, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=fifa+16+download+for+android PDF link annotation
    • http://evrokomplekt.ru/userfiles/file/romuropoladiki.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/pagabe.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kalemisu.pdfIn PDF document text
    • http://wohingltd.com/userfiles/mukozipenovoxukireweta.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/fazuzoniwavujetag.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/miminelopajebidorim.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613af451d16af---wujokanabuzeresid.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c119e26eb5461d092c3729cf76cd6d9c/pigagejovux.pdfIn PDF document text
    • http://woodwaysindia.com/uploads/81773523125.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/bosamoxewetitapewurana.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/53534111857.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/7093283972.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/49106082352.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134c43b04ab1---98366137864.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/10858227009.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/83263392999.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/33564119389.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/8180682859.pdfIn PDF document text
    • http://ombs.ru/uploads/files/geforugineriwodidaluzilu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613174d14415d---80105065858.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/boxaxok.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/55741219237.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/vumepinofodobobakaxumij.pdfIn PDF document text
    • 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_off0000b039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB039 14440 bytes
SHA-256: 9a9cdc953ffe7afcfbe15d196d8d66781999bf66af716a22fc323ba6e91325b6
font_01_sfnt_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 10232 bytes
SHA-256: f5b430cab33b7a12635657adc5178682ca72daa3286700a1e2f2fed21574dbf1
font_02_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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