Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff23f1b5165fa67…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 06:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13d702e74f068109b894747595dbf821 SHA-1: ef70da845998dfb96161820e7af20f873e99e502 SHA-256: 3ff23f1b5165fa67b9fa72fc3dbaccda221a15b0a4f14cfd30568872cdfa3894
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=quantitative+problem+solving+with+rational+numbers+worksheet PDF link annotation
    • http://uptownherndon.com/uploads/files/xukabogetasuno.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5afd0e5b96f038b0fbf2dce4fa45c15e/jipofolajuvag.pdfIn PDF document text
    • http://splogservice.ru/content/file/sirawu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/74236963106.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160772aba1c523---zopidatanajalarigo.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5fd3c81c2---gunibowidinolapubilarakep.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/wiwikerojatiwikunelizajiv.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/wufavopipenafujarov.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947fe9eaab6---luvoradidusanufewaz.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/4ff0e53d88090dbb17af7e73ce037e3e/52935155846.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/50556994796.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/vezorimuno.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b8a0efd8a---96524824749.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/80417294473.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210822071726.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/posudorasakanepexagaf.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/todafevolaxitupediviroxu.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/82413511100.pdfIn PDF document text
    • http://tele-video.ru/upload/files/dolixegejuj.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/84183595448.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e63ec42e980---wurarijafilujevu.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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 11240 bytes
SHA-256: aa216e40dd93678f32623f7dd009917dc400125849fa008cc8084e1857c0f22c
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 19060 bytes
SHA-256: b431d4be5c80899a82452bd124440210d234713d1bf0ed7ad0e67cff6fd42ca4
font_02_sfnt_off00010c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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