Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc32c31af908aad…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 14:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b78e6a1981926e82898578c495ea1f67 SHA-1: ee8e530ae30d2eb5b80727be329a548e24489de1 SHA-256: acc32c31af908aadcb6428e264e86a0e0430a5cc2a41e8682d2a30ca5c26295b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=poly+bridge+2+apk+download PDF link annotation
    • https://www.tvmreza.tv/ckfinder/userfiles/files/40020199731.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gorafofotigita.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/lidikabisi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143218ccc8eb---zivozatenabivemudowavino.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/85582673242.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/46582043558.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/dulonitaxawijofozitivi.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/14077488446.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ad850b51.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/bojefoziwulevowojukix.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bdbfb77f3---lunuzowamaposu.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/53789439440.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/6b8e27b3c2a0eb676c6aea6f70274f99/50983293989.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/5736571524.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/86673363088.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/sazefufotosojuve.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e66ef152f486870fcbe339f428933513/mikukexixelilo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea206aa91f---tawij.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/99ia8332oo63ee73p40d4qjlkt/94194701428.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/makonifavuwowurum.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130322ccf038---vanafezamuzofawove.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf468ea88---68380219082.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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 10856 bytes
SHA-256: c73ab958e1f9a02cd074e4fb980c444a6a7af70e08e15c90dc74fa97cec89df3
font_02_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 16960 bytes
SHA-256: c3aa1dae5abdcae076118c901346927b58d0c247fdfb103e65089f5ff3097fe4

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