Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51ec7601c26196c…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 16:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af910d3fb6b44b6c2fa25d2b3b3e510c SHA-1: bfc01b33af422d02a1659fbf11152d3bf2fef2c7 SHA-256: d51ec7601c26196c97e24f5ee46f5434f2ff7123b2894d7f9904601916ffc0fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ccshecea.org/upload/files/xubezeveduvugadusajafibeb.pdf In PDF document text
    • http://elosc.com/upFile/file///ITX202109081534501554.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e2ffddee377454782dacf3807b817fad/pidut.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/megibofadiniwutupese.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7555bce9---51684238952.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/wuvojawemajuduxolifevazig.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/21251556129.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/96736135515.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/93926831468.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/jt187ht6rrqfaukpsa4eb9kh95/77894617243.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/38230353634.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/95257751488.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/fenimof.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/duxajunosukitibujajotixu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350c3023560.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/15416469530.pdfIn PDF document text
    • https://jck.ro/userfiles/file/52182284387.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613607313ec9d---virafagu.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/bufosogelibaxuj.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/43920340391.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/nixege.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/wanaponabatifikukirug.pdfIn PDF document text
    • http://industrialdevices.in/uploads/risafiresuzosulenekole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=online+converter+youtube+to+mp4+freePDF 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_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 17004 bytes
SHA-256: 1a642c5c337ed035f917cc009a4125a26f447a5e0fb35f8e780c0ca07a22fbdc
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10832 bytes
SHA-256: 8533f9e727fed92b2ce4ef15a2ff33fdfb34183dbfc99cd04134869bd6834327
font_02_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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