Malicious PDF — malware analysis report

Static analysis result for SHA-256 93966034fcbe2b9b…

MALICIOUS

PDF

76.9 KB Created: 2021-08-19 05:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b9dceb03e15a9a2345fd7417b2ae870 SHA-1: 4a7233cfc21f4fc7717aa022781539947054642a SHA-256: 93966034fcbe2b9bcabde8c06f97ec3ce6104c88392f1cee25ed0adf39120a5e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://arcos-eff.it/userfiles/files/21476935890.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/4026e298dc424f8a08211b301779d944/vumemuworev.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gorerazezetadiwunuguzale.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/18755454612.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3730f848d7---11816998124.pdfIn PDF document text
    • http://taociren.com/upload/file/21073120524415162645yg0ciwe8m2.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/28765185410.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b2b4b9ba3---ledemerikosagid.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb791f7d366---miginorusovajupirena.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb5d36f8d---zilonike.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/71690163128.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfn7b5ehp2ofvbd10t8slnoctp/kisezewesebufonib.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/lobuvegujakaf.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/7761994344.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10d79dd04---pokinuwiduliw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7a223da42---55160396589.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/23665333370.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/lu06lvvqd5f4d4hk1q9gff2k8a/1313368856.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/pafegodidosimisijumupuga.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/rivabuzekopipebojuzesofi.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/4065843376.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdde85e7a80---90623877322.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/88800955482.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/pefamejatopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=spartacus+blood+and+sand+movie+download+in+hindi+480pPDF 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_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 16584 bytes
SHA-256: 5e8d70bd66b953ed07126912d44dfc960ecd2f6e03f202f45325046abe511b40
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 11656 bytes
SHA-256: 2434a3cc3e2e119de02e1545c5da1f05e3cd640e31448dc2a010967207cdb8a5
font_02_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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