Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b66030b264cf8d…

MALICIOUS

PDF

101.0 KB Created: 2021-06-30 23:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd20b82392d60c600fa58e5f7507b285 SHA-1: a2e5264cce6233ed54d236e1b74cd72fae06be3f SHA-256: 12b66030b264cf8d3a19af30eab7cb52339322469ed35a70a10aa263b4b723dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The primary attack pattern involves redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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=the+river+between+summary+pdf+free+download
    • http://cs-web-design.de/ablage/userfiles/files/bonulexidumul.pdf
    • http://assushop.com/userfiles/assushop.com/file/nuzuxifipakubazita.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gmhajkkqh2km8e0kvp7va1dhl7/jovisefukutozopubupuzemu.pdf
    • https://wemservice.com/ckfinder/userfiles/files/3591732317.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7b3329420469469fff7c8dc8312dffb8/zafezemi.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc9e3ba80---44219205975.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cef83adc9---53268322258.pdf
    • https://etadelloro.it/images/file/2446737839.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703613167a7---79737836258.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/suzokadusilerubovi.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca123de998---38368885614.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/53486985131.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49babd56b2---seletagu.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/mtai7uuqe63p9b78gnqqa3aqe2/gizelokal.pdf
    • http://www.anclupnapoli.it/userfiles/file/vemunawubavuridavikubukor.pdf
    • http://aarogyamedico.com/userfiles/file/73441875682.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160816a7809719---92011328772.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bfaf1e3f0---kegudanu.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8080db6b2---nurewasozebuj.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e61b27f9---godiwum.pdf
    • http://bortran.com/upload/image/file/20210610024916.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b349d71b261---vinozetisixogabi.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af5fa6c721---bejukaroxozedipetat.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hfh4q5d3rb1kee4oha11e8bctq/19051782696.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 16792 bytes
font_01_sfnt_off00013e04.bin
2ffa68fc192fdb4f1c57d820563a23aa679904a9c1309296e19ea89dbdcf30e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E04 17700 bytes
font_02_sfnt_off00016c62.bin
36386dafd346831a0f8b3128e5d10e7f155af8fc8595baf1a5a549ab209d8e76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C62 11232 bytes

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