Malicious PDF — malware analysis report

Static analysis result for SHA-256 1513080737a9d690…

MALICIOUS

PDF

87.8 KB Created: 2021-07-30 23:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 338bac9ffe58089c3188145f110bd239 SHA-1: 536fc6eedf9f6b76d8ab157b21d09bab559c1c2b SHA-256: 1513080737a9d690b97a819276e8e84ff6f514070e9cf92f14da113b2500c89e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or distribute further malware. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mesterek.net/tmp/90498852757.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/jrcm08a979rr9o7g9ava9midn6/fewamawexogetijeju.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/caea45cf464e2aa644ac2224aa41d2bb/68622815871.pdfIn PDF document text
    • http://goref.ru/files/file/gebutitas.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/jepuvetujukedogi.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/3219197516.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/69433303629.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d3c4f2864---77828906006.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/wudiwuridaxupu.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/sizakajafinomubegawewup.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609115eac48c6---vidofebenisulewemu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/69483484145.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749051c4f19---12320319127.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/kiruva.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a08afbe1226---31908998733.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/worivujapunodomot.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/40986241763.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/telovedagizorapulawan.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9571c65a0---wolobakefokujo.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/71678057620.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/wepiro.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/raparugidogev.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/4128977883.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/t41l5o064vmjn08o6dbqdorqei/wuzebojuwafevajimorusu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/19412111176.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/24816934521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=wwe+2k17+game+download+for+android+mobile+apkPDF 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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 11108 bytes
SHA-256: 1051f6ea5927f23bbf5a10760b78898cb507da1b3ae63cf060791d39fa2d7cd6
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16876 bytes
SHA-256: 4be56f72164dd5f52246cbd72954b4ce6474d208687420b848d5471bb57a6a96
font_02_sfnt_off000138c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1