Malicious PDF — malware analysis report

Static analysis result for SHA-256 6093e829db48c39a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-23 13:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3257ca6d18494c4b7acb7635529d5d62 SHA-1: 75a247a0f1fb243ca26e40af2af4ecafcf357c7a SHA-256: 6093e829db48c39a398591872dc5fe9e1910fe773a6906f46e83c670326e89f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=the+last+witch+hunter+streaming+free PDF link annotation
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/xipinewodawadop.pdfIn PDF document text
    • http://fitviewer.biz/files/file/30931340613.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/nigonekovuxefuni.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/zunoxadejijuzanuvi.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/21376941702.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607286ffd9153---74924442916.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/88988362759.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/24252343162.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/56334923414.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dafc150bfb---tozejor.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b42b906---xejelatafexivog.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/rmm0057prukpfgjqfgctq3ejg1/nirolajulefulobasi.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e66e7022f6242cc2a535bde81a50931e/3219510427.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/vukodomonadejajes.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/82892292534.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/fosaxikivewowe.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/momeleno.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc97c6d599---37322538824.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/kofabofakeru.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/qkqq4juuhqtijduag2klg7fu3b/24297456955.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607590b616032---lexomozuruzajimisude.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/839a689ea998509297c879a8f9b3a525/xiwileranaropiwitito.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/getisit.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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 17664 bytes
SHA-256: 11380805711b123e229b57d0091023385de4d01f8347d17fd99f525ee3b24f86
font_01_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 10812 bytes
SHA-256: 2767127ac3629b952b14648ca04b0033bb1219da58ccf5df6248cf762393d4e5
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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