Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a7c7dfebe84a91…

MALICIOUS

PDF

74.4 KB Created: 2021-08-15 21:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 092c5f4385a2a633ef706ab47830f147 SHA-1: f75e7d49264aee10e2fc00d408e375cc039f935d SHA-256: 18a7c7dfebe84a91ebcdbe6ab08e294b3b49f8783c204e5fa6c063d9f8802abd
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://turinhotelcompany.com/userfiles/files/kuzudutumarutilelixupov.pdf
    • http://abwcoliseum.com/uploads/files/jinakomefemafirujabo.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ce517e253c62888e8118d9f9c118735/95835663691.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5nrlal5mb6ns9qsevhk6itel96/paxeke.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160707034d4728---10557809285.pdf
    • https://wineart.online/userfiles/file/saduxawomowabaparunu.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210620_59BB99BE0EFA5B87.pdf
    • http://ticaproduce.com/ckfinder/userfiles/files/rufifixi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac0ecc82---99686894734.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3bb6dfeb7ffff7c1449491b690f3888d/85786411858.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/99027024899.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/b29c5f56b4686ff1ecbe9b20f311d577/89291802923.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107411c2dca4---siboruvipabuju.pdf
    • http://nwatchonline.org/userfiles/file/3937910875.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f8a161c9129dc3da82b007dd1f88b49f/26218417638.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/8355447368.pdf
    • http://grandp.ru/userfiles/file/59605417034.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cfd03c9f59e964201cbcd95cb681925e/dupurawisirozojef.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/196989470.pdf
    • http://orderkiwicafe.com/uploads/files/vonizozimexapisasigewo.pdf
    • http://diegogenna.it/userfiles/files/rogukuxamubusuves.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fd203097199e665d971107f9060a0163/31216655867.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=exercice+m%C3%A9diatrice+d%27un+segment+6%C3%A8me
    • 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_off0000c02d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 16792 bytes
font_01_sfnt_off0000d83f.bin
fa7bd6288df46967522c92e074730492c55a8973c04834a0e54dc3e34cf7dbbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16080 bytes
font_02_sfnt_off0001000d.bin
a16c299ca435fe0797dec5b9bdf5cefef0bcf48524b45b36ebb2e56dd7295311
pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 11244 bytes