Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0c2f3466b15a88…

MALICIOUS

PDF

93.5 KB Created: 2021-09-05 02:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e4e4df550354b573f82e8e58dcc9b9d SHA-1: 54c5cb5f99e180a0d89e4c81d1f836b7be04a51f SHA-256: 2b0c2f3466b15a880efd1cdd90fb3ae7b4eb95d23cf95866df1ee92f3c749d5d
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://exima.kr/userData/board/file/pajuxuterebowerejopo.pdf In PDF document text
    • http://biafrapol.pl/pliki/file/61211752995.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/42857515144.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/getewiwid.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/8124271954.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/xabesosubaruwe.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/e87c2592e846857fc747943d433ac767/jaraletunagupugewi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b92ec25d---32781162986.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/768a8a2b4ba4a93b0645204c806d6aec/27114325580.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855db7cd2d1---sawiganovukafemejaja.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/65635800495.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/mepivorazadema.pdfIn PDF document text
    • http://sbcnepal.com/images/file/51925780369.pdfIn PDF document text
    • http://sdds.be/userfiles/file/serezupimadamipuxopafupub.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/miladesewof.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/kqvlvugv3m5p9p8ddsijanabs0/81612196291.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/61072121179.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d371a122d8a---79930124464.pdfIn PDF document text
    • http://sinoorchids.com/image/file/javujep.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/fddd49fb5b21cc2b3b2c830574801ef9/75812219302.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773f085543b---79322894375.pdfIn PDF document text
    • https://tl-systems.hu/files/files/71904874798.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/juvexekusagesakaminug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=endodontics+irrigation+solutions+pdfPDF 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_off000103a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A6 19832 bytes
SHA-256: bd1da08954aa31cdae03392bfdd1550d39d2334b1c6f8cdf5314da525a609a11
font_01_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 10744 bytes
SHA-256: 3ec5eef604153e21dd25dd61cd1b2c3f1ca85eeee8eff3c02eadf4d225eea77d
font_02_sfnt_off00015012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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