Malicious PDF — malware analysis report

Static analysis result for SHA-256 d248c6ac4b6dc20e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6db9fb560e4881f6e1f72ee286fa3623 SHA-1: 480b335701bb8aa9236e676cf9426917f5cc19fe SHA-256: d248c6ac4b6dc20e2f2e58f7241c37a6b5099a66c225a562872465c47a3316ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a80u042o7kqea1anfbs9vcano3/tuwovezesewobu.pdf In PDF document text
    • http://sy-smile.com/upload/files/61202458300.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8db3cdef---37000422886.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tinabotisapevemodujeguj.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/18022129521.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/54320640445.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/melad.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/37875657475.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161030c003447a---musagixorix.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zibezipiwugazevamosep.pdfIn PDF document text
    • https://mfdesign.hu/files/file/61816381791.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/xarusufobojeduvor.pdfIn PDF document text
    • http://greenbrier101.com/userimages/90908301628.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/331ea8emq2285jpdq5cmpu6r3e/buzukaduzezajagaxesikide.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media//56939447072.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/49340422645.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/biregubafedewuzo.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/99934731611.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/80ffb304ae38fa3e576ed7ac6f8a41c8/xikitar.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4816cc9d9---ramimurumunisoboga.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d512d72fae---risep.pdfIn PDF document text
    • http://www.depomatrial.com/file/63304705604.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/2368567949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=avakin+life+apk+unlimited+moneyPDF 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_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 17948 bytes
SHA-256: d9878ebec7ba4964ccfdc92310e04b3247f49b1a4f94f8e19ed45a38436bfaf0
font_01_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10744 bytes
SHA-256: 48aefaa42719d0fc771afa3ee7e575350e01f49d9864b0fae941da1f3baa47d6
font_02_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1