Malicious PDF — malware analysis report

Static analysis result for SHA-256 445da66dce296cb7…

MALICIOUS

PDF

95.9 KB Created: 2021-08-07 21:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff3ae6e2fe10ba7ae1b0074ddaed0ca3 SHA-1: 4789c4f7fd99144b06e7e4f6fd11716602155488 SHA-256: 445da66dce296cb7faacd9a764f6664a209aacd09d9b97ea451df522c62f1eb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary attack pattern involves luring users through a malicious attachment to a site that hosts further malicious content or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rsn19lq2gcth3dg2l7g295po6n/dopavakum.pdf In PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac950bd75a0---widovaxarumativuk.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb73ab6b5c0---wigutanogoguvipavi.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0cb30af2431411f4a68ad51eabac8ec5/pepiratupelilinuke.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/nurimukepukonedoxite.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/43112737470.pdfIn PDF document text
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/gukubo.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/dijonolipitetomonewel.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/xanidenoxego.pdfIn PDF document text
    • http://954move.com/clients/4890/File/96787388808.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160809098909f1---nabilunebajolegikuniko.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/575e7a896b59983ed2898bf1d59c2b8c/55240028946.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/25466588067.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/7142676465.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/rdm3qgbi9o6psqe0sd4qndn553/6760834386.pdfIn PDF document text
    • http://ceroki.com/image/files/lunezobawetexidodipesen.pdfIn PDF document text
    • http://contextuae.com/resimler/files/supifavakirapadi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/fuzijogug.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/bonejide.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/b97vi1i7pq76qmg7sfs1kvebjh/58681697919.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aea40b5966ee219d7a64bb8f14c677af/xugugazebukagazejowafu.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/28727158065.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/569e613c544b58c76dc8d4e84230fd06/zugugudezitalodizoti.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/96224184777.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qhelehtmu5imne69oui2cu31t3/29523839954.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/velaxefapevatikugurinad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fundamentos+de+investigacion+unidad+4+proceso+de+elaboracion+de+una+investigacion+documentalPDF 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_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 18680 bytes
SHA-256: bdf072d9852e3bdd0bd16b2e041831e95504655f0aa460387fd024633d89db62
font_01_sfnt_off00013b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B73 11216 bytes
SHA-256: 92f68d487fdec111080de61b86589ab6d1d56797d208feefc26ba39a61c39dd7
font_02_sfnt_off00015554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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