Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d4c40558a0177…

MALICIOUS

PDF

74.2 KB Created: 2021-09-03 13:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d23078fa5f058bb48e97b706ea98894 SHA-1: 3aff01b2a63a7ba4feae248d91fc6fb53f511060 SHA-256: 7f0d4c40558a01771b82f86be41f9fa2f6f89d502680fce090e28bb98edf6e3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which host other PDF files, suggesting a link farm or redirection scheme. The presence of external URIs and compromised CMS upload links indicates an attempt to distribute or host malicious content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609850f7f00fd---jowiki.pdf In PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/824f83f0236600d9ab63808b43a70972/lirop.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b22282c8968---48806146939.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/81ce43b57eabf6ecde295cffd48dc691/fasinuwokikuviviratarigi.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/15955857494.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/pakumubejotefajowusajo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bcf11b9f39e2081238679aa8fc6ca8b6/5136400815.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f7c8g4j5576258ohqbfkifei29/lovagibadi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/otr1bt4hpp964ou2dp31vgfn46/nawijajajitaga.pdfIn PDF document text
    • http://teknis.it/userfiles/files/fidonir.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c18oq8lhgf9mb2v09aqk30lr1f/jemilol.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b333ed99e30---66515062730.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/4182812211.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/puvuf.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/95038048120.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/minezokajizezubovuxudado.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/gelirafitojagufa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79fb2e3f0---jasigomodima.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a490b49a181---43994601353.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/60494760651.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/vanikevubipas.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607763d15fd9e---bemigokumu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/58250220609.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/48243696285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=siemens+tia+portal+v13+manual+pdfPDF 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_off0000b98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A6 11124 bytes
SHA-256: bf76ac96266d2d96df08e567459767e2bc8a1e5ca665df93d45122dfe5a564d9
font_02_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 19100 bytes
SHA-256: 0c6a691e3d8048b962ae98c8dea83c204d6af6d8af6500cc98c47402f10c84e4

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