Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c550ff0aad80071…

MALICIOUS

PDF

78.6 KB Created: 2021-07-05 01:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7fefd63589f6b7cf22fa43e4b8d0e3e SHA-1: 2748e10e7359c4de93db220f350946c7358c5998 SHA-256: 7c550ff0aad8007128e5afb855ec40a2207a67ac6647548a85ccb60b5850b2b1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs that point to various websites, many of which are hosting other PDF files. This behavior is consistent with a link farm designed to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4mdgvg9ruq8nvdp66fc6khaka0/92819619765.pdf
    • http://amon-syotengai.com/userfiles/file/soxusisu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec2b471a9---rizes.pdf
    • http://sva-jeanroze.com/xmedia/file/83674427037.pdf
    • https://protradingindia.net/userfiles/file/sofupadalud.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/gisibaxizujekejasewedad.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa531ba960---zurowuzu.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/vasuzopopexepunenamulox.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810698609b4---getenoluladunaduxozila.pdf
    • http://kino-cosmic.ru/sadm_files/65089160899.pdf
    • http://kruengrangthai.com/files/files/ligoburimevamiboxakonazi.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/1d8771a35acf27057a3807121a70fe3a/4219575808.pdf
    • http://ridendo.cz/files/file/bapagil.pdf
    • http://buergerforum-tirol.at/file/88083438515.pdf
    • https://bookatowncar.com/userfiles/file/19811446739.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e571718f1ab38a486ef990c592c40a88/52383749608.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/14696222887a889aaf4d66b18fbfa169/33447541465.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/09eee1e116d25d7f45565ae893e79d91/nagapenoluvekas.pdf
    • https://repare-ton-smartphone.com/userfiles/file/liroduwomik.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9t1nmqvnmls41njn8i9867iaj5/65621248056.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1b16a6e301a3f03d7706e543e13e3f52/xezaximurasarejeparimusi.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6fefb4ac34afb3eb38f439442ea3411f/kigedegojurimakuwezew.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=arcades+with+bowling+near+me
    • 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_off0000ccea.bin
b6d95d67ef2e8d815c1ab5c9dc3dbc2436ce81210281a8ef2d1c78337ac97ec6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 11024 bytes
font_01_sfnt_off0000e63a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16792 bytes
font_02_sfnt_off0000fe4c.bin
9e145a28e910a6153b815a87bc1c0774249067790b6fcbe972cf31287a150613
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 17448 bytes