Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f589909611ccb8e…

MALICIOUS

PDF

93.3 KB Created: 2021-07-07 06:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36fec781cfc24b514c2762698dec94a7 SHA-1: 03c56de36f57f1c610a42c8c763e01a9b42c6316 SHA-256: 2f589909611ccb8ec4dd80902a2b05d870ad3919b8a33e9b4e6717ba32abedcc
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL distribution suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://szao-spb.ru/images/news/file/xevugopisusalizuliti.pdf In PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/i95soku2jtp7c8om8m44kidq32/jivisozedaxuwelu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a813d4a3fb2---34031431195.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/cb7fd81c1db6d3047998beca7ede2373/fukikexuburivimaruk.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/33503842441.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/dekalololetalelo.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/temibaler.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/segileso.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210606/210606123005894103srx7mz9t11jd.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tafukefi.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/88389084885.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073985fc117a---52643913149.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/81279426363.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b43caf2c3bc---88872847884.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb5a7b5ca---39444424857.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e506cc04cf2---mikepitob.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/129e08762b0b0f0e6999af84818fd91c/zexuginuzexiwu.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688318aeb2---vebewigitog.pdfIn PDF document text
    • https://bselink.com/userfiles/file/71433151687.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c54756f8---tesavikuxi.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/kopurolezoxegeb.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/memafikivaxojukalapiwoji.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2d823eaa---65905640670.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/niwivelole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+measure+a+chainsawPDF 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_off000104a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A4 19576 bytes
SHA-256: c2ce04663a303f15ad63a62d7fbc82fbcac175e6c61adbdcb7c54ae9705be7c8
font_01_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 10780 bytes
SHA-256: 70a0a6da34fab76ae93688964ad1bfb1f9e4a4a306c1c0e3af1f6c89597cd26e
font_02_sfnt_off00014fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1