Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2b2733445a058e…

MALICIOUS

PDF

68.7 KB Created: 2021-09-19 09:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d649866313ee4f8532c24f6c792e630 SHA-1: 2adeb18460d8581862205fa3ffe1aade52a38d28 SHA-256: 8b2b2733445a058e1d3d4322fe18df78e2a5247ceecc344114d740539bbb13f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://seowonbattery.com/files/fckeditor/file/1073520359613caf21a9281.pdf In PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wizepetanis.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/xujadijurato.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/84408352768.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/kuvadijojuge.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136044c64510---85250062495.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/tevefatatez.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/77866232622.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/fofofaxajoferane.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/64edpn3o2t0dkk6tqet78vv4v7/tevumotugakifozusevuj.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/eb6eb41926869dd12db25c11cf90d9bf/nogifebikav.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/pegerejetitabufe.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161443a505a144---jakewas.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/31372303081.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/13584984820.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a9iijs909o3fd8gsouh5bkabis/62706984417.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/91715233520.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/63165262382.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/65919768780.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/27411082599.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/72182536951.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/pikufefepuguruginumubani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=powerpoint+app+free+download+for+laptopPDF 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_off0000b0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AE 14536 bytes
SHA-256: a93519b76b945b8782bc84e89d8cd41351dcfc14da94a93e550fa0fb15538843
font_01_sfnt_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 10408 bytes
SHA-256: 8a73bb420e19d25b698ad2d4daee175fb639521bb35d3a8365549c75cfb97f96

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