Malicious PDF — malware analysis report

Static analysis result for SHA-256 923fcf76759a7f4a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 14:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bf5045c9644f334b266bcae02da80bcb SHA-1: da7dc0cc93cdf4cd063dc8e0c3dc1247fff3de1f SHA-256: 923fcf76759a7f4a58411701d3ebe593514108cbdc2d4ee1ecc8c7459df9b83c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to distribute malware or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bukharageorgia.com/sites/default/files/file/61037353444.pdf In PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31937f0b5c---74752396011.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5a557f70599e5c22bfec53b7b86c26cb/jodimililozefomiva.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/cb33191fd160d9d2671732d8d589e5fe/98240630912.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tubetavobifimovetizex.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9aa1bc99---goxoxowexexovurep.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/03ob91gnm0pipugi1ivvprdoi5/81542496609.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/44341320317.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/83379818717.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3df2011c---puxufodu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/kinin.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/desuneguvofulekesaxid.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/eem6816iu3o3u2doggiv6di8q0/bogikebukadixek.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/altdsrs75t91jjmdtq6rmk1ulv/30794932091.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/54651488912.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f98f67577---34536324641.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6cd0dd9d7f3c426eb90488589ae15c3/39019317699.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/scoa0ha4adsutj7nq4vpu0ne2r/revapuwoporekivasinebana.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/29f1a02cedf49249738b47a5c62dc15b/sonuvanijepenirawuveweg.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/rojemefevinalo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l9ek7lbaohkodcsffgmbpvbk05/30733194927.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16074a79b66866---leraboxodediborigakozob.pdfIn PDF document text
    • http://palami.by/images/file/romebabedeliwuj.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a638a22e7cc---wuzedexojur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=360+as+a+product+of+prime+factorsPDF 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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 20192 bytes
SHA-256: 85b708ccf5e64ec48317e4fcaa3eb6682f7012e54eeb9dffb6f0b24b46b558e0
font_01_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 11096 bytes
SHA-256: 4936196d035c1c5104deb1a431070b38b716e80eae0e4ba9841cd16c16da0bf8

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