Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b275e769521eea…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 09:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 43c320b679d0a06e92f7b4d3a4cac8f0 SHA-1: 12259c0a83327b20c421826bf085ba89d84876b3 SHA-256: f6b275e769521eeaa8489bee81e7636d79c4f98b8e396a70a5b38e307038e195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://milorem-service.ru/userfiles/file/35693630259.pdf In PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/42a3370b47213c7b8ba1f65b58fbf88f/xurovawud.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/62139059382.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346813633eb---sufuvutepof.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/72672605632.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/8669330182.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/260d1914a6d49973bf09e663b195c792/36561141358.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/padizakadup.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/zobowusumomelafanag.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/29842126462.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/41779611681.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/8870355185.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/pufenatoxebaloxakulo.pdfIn PDF document text
    • https://wrd13.com/force/file/31368693420.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/85061608135.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/13602113587.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/38805042307.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/6412998638.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sobuxaxamosanin.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/84615517683.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/67273340415.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/fixuxepi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210902035021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=name+reactions+in+chemistry+class+12PDF 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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10760 bytes
SHA-256: 3aac342f031e016d403a970b04df393b564e1f60778ef35e6dc7715a8b57fae8
font_02_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17444 bytes
SHA-256: f454d9a30d1b22e192688842fae985d4ec98ab96e340d4e87645730b9d69a032