Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ee331e48c2b41…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 00:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 702130755e7edefd4587fb161e4b2153 SHA-1: fc98909f9ca7f3d38b7a7d69b4839aba45579bd7 SHA-256: 5d8ee331e48c2b41e69809519ac0f9fad2e9477a8c4216784a107cde8bbe64ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=how+to+screen+record+without+them+knowing+snapchat PDF link annotation
    • http://cristal-in.fr/userfiles/file/36745202545.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e06f2b9b4---wepedawurenev.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/81924255940.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c200dc0a6---ragobeso.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/tinuzobin.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71507315398.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/14940820493.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc2446512b---3439944767.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210901110307.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/devadefupuxede.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719df0d98b---67976545148.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/42819250129.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/75840946911.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/gukubew.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/90378070034.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/lesin.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/nolanelexurigix.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/fidexinum.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gshntrov6dmepuv73i7ur2m6i7/savifajefo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/kademabetama.pdfIn PDF document text
    • http://savemaxint.com/files/file/gamesu.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/29000856587.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/fekojagegusosozupedo.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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 11184 bytes
SHA-256: 6b7d8c4595b4591d940afbb21503adb4f3bb3c208ea01cba399946cfe3228ef5
font_02_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 17380 bytes
SHA-256: ac11fb4c1ac951e6e11b548d8ec876f03b7efadff24d391f7d0515b1602af5e6

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