Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5892fce7a41ac7…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 20:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae83a57a6d92733bb5c3dc1126fb7daf SHA-1: df67df9a28d053490d98e4e78acc39083d11431d SHA-256: fb5892fce7a41ac79d9c57e834c60df36e9b650f7fd46a1ad86247a1626ecaff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ClamAV detection and ML classification. It contains a large number of embedded links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware download pages. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://crewmak.ru/uplcv?utm_term=social+networking+site+designed+specifically+for+the+business+community PDF link annotation
    • https://triptoboloyfoundation.org/editorsfiles/files/nesug.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/47770082667.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jamoxufajog.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/55493907207.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109021825058642.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f687171ee3a4f491d332157f476ad20f/poriruvozori.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210917022316.pdfIn PDF document text
    • http://dsfly.com/uploads/files/76313422219.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/satoninuw.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/39981708721.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/getevirobololunozase.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/3d89e83b039b1a6fa55ac4f8bf4651da/notekirivumukobikazora.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/ronitunopej.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/80520155044.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e77876f3a---woxidaxaguko.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/lunefujofuwajopalos.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/faparovi.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/jebut.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nanegonaruranat.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/fobesuza.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kuvisovetamiwixoluwa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c43500ae7b---diposes.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161327aece14cf---44476250634.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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 11676 bytes
SHA-256: a64308f993bdc717530f8ad8c58c311c1b90a7a38af9b192222e4029a354299b
font_01_sfnt_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 17540 bytes
SHA-256: 7c3c5c9508a723743670a55b6a99de4973ac42824c64afeb0e1ea963c99b364e
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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