Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62b5d6fcbc207cd…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 06:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc4671dd43fec44c513ca37985cf22b7 SHA-1: 56021183b8464ded9750962cf6517f827233c85c SHA-256: e62b5d6fcbc207cd793691f3f25b78f9e722e56ba23c5061ba2ff9df27ea8a42
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=redmi+note+10+pro+good+for+gaming PDF link annotation
    • http://pvvc.cz/files/kuvirisuvokiwusapepu.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/daderowefomanegepezotiv.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d4f2f48350c87c637b9e26a43a652641/jabitimodat.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/13218291021.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/sobawopalovadowawalo.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210902014631.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/9235012146.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317fb00f23c---zozamevon.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/senujibov.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/maxamudokadaneridax.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/fusegabivutovogopebegi.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/dalus.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/kiginategerujezugoxodexuv.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/gixeruputijekobeze.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/pemiwuzemigekadupaminisum.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9c72055a90a0e436b6673d256ead7fc6/36535307807.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/xilujupunorexozegasi.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/94336769617.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210904_074706.pdfIn PDF document text
    • http://talleresjpg.es/img/file/97453540025.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/47340647814.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/rorelafuzotoguze.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/de53054b9bf0f84853fac59a87a68ad0/fuwoni.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/49246955621.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613340ba8bceb---zutazujatebijoxibuluja.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_off0000e3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FA 10844 bytes
SHA-256: a61f8f9b315b516277e80204043e1cd6f5ddfc34d0412581303620b205514966
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 18228 bytes
SHA-256: 42415760ce1c7da27fcc41f6f6e4e8edc9a224a9a1f0b180b1ab105b31ffdee4

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