Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45e206149d2615e…

MALICIOUS

PDF

73.5 KB Created: 2021-09-03 16:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0845f754f55c41563b9c0201135f5213 SHA-1: 66e9079c63a749275762c4bd7071a1ad310b651b SHA-256: b45e206149d2615e05b859429b017ef1a390284780885c485d257b0a4c058606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs pointing to compromised websites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URI links and link farms indicates an attempt to leverage SEO poisoning or other techniques to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=strategic+management+and+business+policy+concepts+and+cases+pdf PDF link annotation
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1725c1e064e0946209f027b4479ed9e5/46445194785.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/52e65cc467bc3ec50d7322a894e6febb/mudagilepomule.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/s7loj83npnu74uv66vbrq9607o/zobegopidim.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/70446f294534e40289b1c9bd34fa4867/raperovex.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///43701089104.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc2cc98e1---51954026161.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/45114763266.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/34181544319.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517025927279418.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070306ca0af6---zefapeponugirafemelevave.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rbs14c20qtn56folncge3e22ac/8647242775.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160802ac0820d7---29745107172.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/k68brpilqpsg6bhv4ce7ukep7e/95956298967.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f022f229---19350089634.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/56089923153.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/puwefarapemanodefun.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/10981049073.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/dda51551d5ddaf546c8a3aea6c01ebaf/90657471630.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/t5rijojdi4anldnmsb19ck3npj/87638791447.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2782f2fb---fabadavexibelezege.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b31394e04c---wudivuvemasilegonuwev.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ca44b506---11624283889.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbd477091---begadavupakofodig.pdfIn PDF document text
    • http://tipiland.net/upload/file/poxowijijos.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_off0000bea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA6 15276 bytes
SHA-256: 86dd5161c825a75fd84349430e98770ccea22f60f8f02ae35695141e4e799c38
font_01_sfnt_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 11392 bytes
SHA-256: 1ff884f365cdbb09717ac1cda51afd5de7b61c700ce53fd107c817b161ea838c

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