Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfd8ab97c678a7b…

MALICIOUS

PDF

92.8 KB Created: 2021-08-03 17:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 278225cd8d22604097109cb520142536 SHA-1: e4d8e344809cf842f381256c6cf17e4471f1e1f7 SHA-256: 2bfd8ab97c678a7bca356f4c4bb17c2d68d75d3cc73b295813ca1936426f79a9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and a link farm structure suggests an attempt to redirect users to compromised or malicious websites. The ML classifier also strongly indicated maliciousness, supporting the phishing and potential malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bucatariizidite.ro/printuri-fi/files/borebolokud.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6hiqadhrkjd811pt9v0kj3sdr3/puwutoxabibewikimepaket.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/39210807025.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161044638cb01c---66535979531.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/wuwegojadasaxoxarem.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/db4664d9933326c91802daf7abc46501/14851350834.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608481b776009---47725112935.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/dvr45buhsuso6vu8lpk0q3t99e/50535232558.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083d307827f4---pitop.pdfIn PDF document text
    • http://sns.hu/_user/file/40989528409.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/08da1e7a60576c7c350e460b941d19b3/toxobi.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/tiwetujoragiberagulakod.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed800a8d4---51123612167.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/8422704050.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/visez.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/32862578437.pdfIn PDF document text
    • http://qca.ch/userfiles/file/vujafekulopapamiduguxiges.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/becc48ae882dae1745e12fbca06624e1/65492931409.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/71137521411.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/32176185654.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbkdj7v4t47setkte1bfm3uok2/81731185679.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/mixugaza.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954768ee5a---82968589729.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/79744509368.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813ef740ba3---83184166421.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64600415d4---38998616489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+year+is+kindle+fire+hdx+3rd+generationPDF 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_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 18232 bytes
SHA-256: 7238261283d710e22da1f105c9f562b6385ac325f38e44959d51eeb54816a8af
font_01_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 11108 bytes
SHA-256: ee3b3ca0cfc0185c453a042cb7e3ad5599a81d55100f06b2f6110a21359df9ac
font_02_sfnt_off00014b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1