Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e3b955f3f091c5…

MALICIOUS

PDF

89.5 KB Created: 2021-10-11 12:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 528b56885577a6e7fadb93993c2ece57 SHA-1: 617dd34e1bcbf626629e6c4695e00b782a344aeb SHA-256: f4e3b955f3f091c5292a2d7dbd78af056982ed4318b0eb02f6e7c2268578131b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' lure further supports the phishing or malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rocincorporated.com/domain.com/images/dynamic_pages/file/72502100517.pdf In PDF document text
    • https://marbletreasures.com/uploads/image/files/43112245913.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff1857bf9b---53937638129.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/45876473771.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/rukowalazevulapi.pdfIn PDF document text
    • http://patchworkstudio.de/userfiles/file/rokekaroburemonuzanagik.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/55165123607.pdfIn PDF document text
    • http://damvua.com/damvua/public/images/files/lideb.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16164007b675c3---posevarawadeve.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/94895213542.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/26923597779.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202110011525228867.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/rirafipafulu.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/vasipexogazigisafivozado.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/vifijimifozavikubukijogo.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/10529794170.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/mobagasudorupe.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615bdbb2d92ad---79005302248.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/46671797708.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/19885406646.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/lutusa.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/19821877030.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/tugod.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7d3d23k8fclpk5lrt240ovi07k/3664401911.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jetasajik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/1hHberoKktI/uplcv?utm_term=class+specific+character+sheets+5e+pdfPDF 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_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 18880 bytes
SHA-256: 85f521ec4bef403eded78f1e59589112d6a52e287a0e9e6f6e20655f8c1b344a
font_01_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10660 bytes
SHA-256: 680e382684c2c2a7485ac19a30543132c7e0d9de3547ffe3beb75fce745715aa
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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