Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4b9812e00d4aa5…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 10:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be027884e0287625dcf98a5c3297204f SHA-1: e60ec757d1d3c64d876179c21907787562ab88c7 SHA-256: cf4b9812e00d4aa5f2f91876ed31092ad6868ece974ca883a88c0c478c05369e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the overall detection profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 https://coretry.ru/uplcv?utm_term=liver+function+test+pdf+2012 PDF link annotation
    • http://palirna-frydek.cz/uploaded/file/55371394264.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/52040812241.pdfIn PDF document text
    • http://nenorm.com/files/files/setesevazurogoletafa.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/31501095204.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3da3bf4344f849cb8b81176dfb595ce0/futevevolev.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/58224539119.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/92046070410.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jafinin.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071c9f9d770c---63317042245.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608596849143d---moxulubamunin.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/makadimelizimedewozu.pdfIn PDF document text
    • https://aneri12.eu/res/file/xawap.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bff98a04edf---nivizafejide.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/piroba.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084f906accd7---42030589929.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/31927960839.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/13020721976.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/tebadesunojumixejuvex.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/31310500818.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/35c2b1e40b7bc3c5fba71a017f37ddf2/33968136241.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096289463416---31585268870.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/32a8c27507d3ec3584f1cdb74f6b1698/jofulekeziboxadiwajatuf.pdfIn PDF document text
    • https://seikai.jp/free_images/files/pigebarajotufenuxiziko.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f18d0a9c30---95647486177.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/gumomogatiku.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_off0000b17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17C 10820 bytes
SHA-256: 28f3920f4d0f8bdaf08eb3d27c8fb5d189be6c5deebbbb9c1cce437ce9d13865
font_01_sfnt_off0000caaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 14880 bytes
SHA-256: 57cc78a1e8500b3891c9192d66871d91d62b8be378d1b8d168e037f85121a5b2
font_02_sfnt_off0000f00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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