Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfc0a18cb4e5424…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 10:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e575f563dccf37275bc5761191910699 SHA-1: 3a0e9e06bf7420095d18d4c65e9e89dbdafc40b6 SHA-256: 4cfc0a18cb4e542498054eee6fbbb76178b9a46b6935e583b6c9bc97709e1299
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. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content. The presence of these links suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://izr.fr/files/nubazijow.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/41535ff553c390ed6ad48cadc4fc07c9/felujuvenulukinilul.pdf
    • https://susta.vn/userfiles/file/34191936869.pdf
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/punuguxavutisor.pdf
    • http://iucecb.com/files/file/bubof.pdf
    • http://elma1.ru/!upload/files/dexilotezulivifame.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613da28de6f5b---18812329796.pdf
    • https://weborder.cloud/userfiles/file///61366042902.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb24534c5a---26390104404.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/tatopufasunup.pdf
    • https://wendi101.com/userfiles/file/76496705443.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/92496a8aa05c6d06a12682bd7bba98a8/tojifajexafixatuvojilob.pdf
    • https://nhahangbienhaitien.com/uploads/files/serebijeposu.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc50695940---puratajosasovi.pdf
    • https://stockbauer.hu/uploads/file/rawirezitapini.pdf
    • http://topoint.cc/userfiles/fckFile/20210902231637.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/c9jn0hnnnbep1npskqkh79mge0/49170869422.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j692rol6mhkg3fcplk0vpp1qs9/zilif.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea48426480---tuwatizani.pdf
    • http://effektfilm.de/files/file/88586033665.pdf
    • https://mptradingcompany.com/userfiles/file/82137604906.pdf
    • https://thuaphatlaihanoi.net/uploads/files/detanonagelexaxogajex.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+8+plus+price+in+bangladesh+2020+unofficial
    • http://perfecturology.cafe24.com/upload/editor/imagefile/25766142539.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_off0000e223.bin
70e3c8298b4235116cb5a93a3df53af6c630110961445c6cd3661a85f048004a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 11444 bytes
font_01_sfnt_off0000fcb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
font_02_sfnt_off000114c2.bin
7017587db3dc03b35549581dbad8004242a79d029d9932395532d54f4b7539bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 18824 bytes