Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c13d239f0ecb8f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-15 22:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e9331a8e900e6047ef8a6c5948432c78 SHA-1: 51ad1450500c291c2739e7c08290f6811b4d6fa7 SHA-256: 27c13d239f0ecb8fd2d13e9b5761a0efc16bc79b873bd86480cd30d843854dc4
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress sites. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest a phishing or SEO poisoning campaign aimed at driving traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614000fc3e71e---pufezon.pdf In PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/pikemipevijemutunika.pdfIn PDF document text
    • http://kaies.net/upfiles/file/vupedufamebekufaxemi.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/zefopuzadalitojir.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613054e2a05f0---pateziraboripizefole.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/73356765419.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/lokuxopujezubi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05d249481---dajimibufelagorenumesafo.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/99630242543.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/wokifidosafapeworof.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aa896928924dc82f9f412eb1f94934ff/zizarixeverasover.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/791f9a283cbe153487679f1b4028ab6c/46553653895.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/17320687969.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/phdb564sqbvqoqq3o6f1ul33r2/kodafebufuludadan.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f46fe3234---befami.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc77c4030---lutezezun.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pofegakejobakewurajapa.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137a75de0789---pizuwesulujaputokew.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nafutilemutakazetof.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e52b5a4500---nipazijaz.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/46853599965.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/34078514488.pdfIn PDF document text
    • http://test-immo.com/file/wasozex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=unfortunately+software+update+has+stoppedPDF 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_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 17456 bytes
SHA-256: b549458c692de1e45cfff71bc65d57a1989522a3396287ba9c8078befb799609
font_02_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 10812 bytes
SHA-256: 9f28db788c6047fc59b26de2da56ba4e81da3169ed557e3d67f5bf6db2bde94b

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