Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd336bb07070caf9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 16:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4b2af98845f9f9021550b8e32ff7b23 SHA-1: b806d618ecfec25dd179dde448e8eb291e9f3315 SHA-256: fd336bb07070caf918da705ed2378f0cbf2c39854b7b8c1da4b55fb33725d1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=imparfait+ou+pass%C3%A9+compos%C3%A9+exercices+pdf PDF link annotation
    • http://liga-stf.ru/i/upload/files/58145824669.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/gajuzidojibopimilab.pdfIn PDF document text
    • https://bataretak.com/img/files/file/70570483972.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/68187532170.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vibuwenoxibasafafewufomid.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f05daadb183---bepiregelerowajezajopa.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/pejixolobunog.pdfIn PDF document text
    • http://mweb.cz/images/file/76319690480.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abd3e991ec---wezulolurodupowotavi.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210905031130955.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/14323748235.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/eb2dc087006bc76a463b13e22ba72dfe/17683439867.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/ea266f286d3890428b3dddd949e06f02/roganado.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/83906410368.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a7f1f270c---92630508810.pdfIn PDF document text
    • https://capecoralliving.com/media/file/94753504651.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jowupumonuluw.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/0oqkdku03usc6dohtil8kc67gn/16711937491.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/pupijinepedamugum.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/35578103632.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/8981470821.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef80d41e8---lazakobukewojufaxoturisop.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/16486832040.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/wetot.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b3d2988dd96d0c0f34f627e4f29f19e2/20793077952.pdfIn PDF document text
    • 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_off0000de78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 21308 bytes
SHA-256: c9d54f8caa871cbff5d325709dda27bc3dac3cdcf59efffc6615bdb686c35839
font_01_sfnt_off00011493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11493 10940 bytes
SHA-256: 9de6767ab6cd6e6f2b55abb2cc4c9e5efa406f66fb8c2804ef88ecadcff94726
font_02_sfnt_off00012db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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