Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28c9a80458b9b45…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 10:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 344a4a3c1f70e3aa8c534c763d613090 SHA-1: 7bf447769d68206cd46c376cf0da5f3f9edfd56b SHA-256: a28c9a80458b9b4598c0530c2ceebb778b1665075d195ea6e3ac22632542f715
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS uploads. The presence of external URIs and the overall structure suggest an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://dishandspoonproductions.com/ckfinder/userfiles/files/demurirujodajebuvaf.pdf In PDF document text
    • https://lotusmarinevn.com/upload/files/79396708258.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/4923798420.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/33f419b77a50933edaf1cb6442609f9b/mafagegexujutiwetojuzita.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/dabas.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/100745044.pdfIn PDF document text
    • http://sz-frp.com/pic/20210928002506736.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae8eb56d4---jujazolekuvofef.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210927123243_2a0jga.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/52244477032.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/33016671038.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/fosominimafoxi.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/27947041588.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c4ad8aed---37468717293.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe69b966bc---20695125335.pdfIn PDF document text
    • https://msiutilities.net/documents/zifopid.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/popuzejexexawolireguxup.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/xofafosisesukuxebivufogi.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/xinilopigot.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1740c8e46a387067588dc840ff0fab35/90816149949.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/jadexafajewevuloturepegaw.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/33584838950.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/60654878979.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/26924785019.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613592e4226a8---35417002080.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/pomufufazuzavawovozanawoj.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/fulugugirabeduzof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=trevor+gta+apkPDF 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_off0000b7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EA 10140 bytes
SHA-256: 1ccc461f88743aff10b79a11c73cfbf46afbaac353b2353f7198a51811023e33
font_01_sfnt_off0000cec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 15640 bytes
SHA-256: ab85097bbb2e19c197dfa956a55de5778e58c47bc99ca3fc370b27f1e64e80bd

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