Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d19be52bd1c9e20…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 02:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d31baa275685802c34d80991630b3dc SHA-1: a449989cc92a6ba31ace1c1faec8768aca57d630 SHA-256: 7d19be52bd1c9e206dc56f49efca3faf9720143d32f8919c3e367c34e80e9f8b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a malicious phishing lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect the user to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://fantasymusic.it/userfiles/files/jolopadobedulubagizokox.pdf In PDF document text
    • http://pedraferro.com/files/files/24224406024.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/4929914683.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a35662314a7---zobomu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/97880894947.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/25489235221.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd185f0076---28496048077.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/zewuguvomilozibelan.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f792f011---66675758381.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/lapugamefetawatav.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/53784684339.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/46678580023.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/13499058125.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/95210018268.pdfIn PDF document text
    • http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094126d08779---kubanikovim.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/augkuvf90c8jfsjada56puomna/zekumewedome.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/goluraroz.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0828/cb1df1686f0fa483a24b6b75fd6f2af9.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1ff87f03---66285388464.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0c2ea35bb---38315531887.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e478232a9a7a6d1e0817b907a7d47a48/13821901965.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608793dc4d85b---24441097965.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/mofazusabovibij.pdfIn PDF document text
    • https://senhewood.com/d/files/sifapabutorifa.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/98280081688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=data+analysis+interview+examplePDF 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_off0000e84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10065 10660 bytes
SHA-256: 7e490867d1846c438358b19cfbe9d801e6f360bf4aa580736a04f5e6b6dac53c
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 18344 bytes
SHA-256: 0b2483ff607dfafde69f12870781bac476efba233529de3c876f38817baaef4e