Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a419cb8d4217c…

MALICIOUS

PDF

92.2 KB Created: 2021-09-12 22:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 956d788f46829b6bc98bb61967703528 SHA-1: 7fa2e0cad1c9ebd2111262c951dbbcf837e72953 SHA-256: b15a419cb8d4217c6bd6eb95bcfae0b64780376fb0e487207ced25a16d5446f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is intended to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=how+to+fix+lag+phone PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021091217080250.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lejazisiwuli.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/39878184736.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/19413145690.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86152e3d8---69827420904.pdfIn PDF document text
    • https://kaparatt.com/images/File/53295350369.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/negebonigidas.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/favapupagumedigawavelo.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/58968696989.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/43510622604.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a269258f8a---79406300419.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/29688936389.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/85146658529.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/90e50528d02008fd5e2c27a2299a9cff/77290214065.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613568393a378---putejakuwiradafevojibake.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391e6edd541---tunususawumoxi.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903035615_9ha73t.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tafolemebuvad.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/87817393299.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/21306770490.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/20214297825.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/49530733618.pdfIn PDF document text
    • https://edex.co/userfiles/files/89720408281.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/91351261633.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_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10548 bytes
SHA-256: 7fdf4e757fd6d298761c03c55f0123bfe9d86b94a3b7dd997690ae9f87b28361
font_01_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 17664 bytes
SHA-256: 61c027fba49b06b7421ed7d4b436b7d3f30b87c316378d04c15af6c5780be6bd

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