Malicious PDF — malware analysis report

Static analysis result for SHA-256 087260f2cdec7bbb…

MALICIOUS

PDF

78.7 KB Created: 2021-08-10 03:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bc1e5ca1c8e0f369411394ba4197396 SHA-1: 3613e2d1f2a8245b4549ee685e8eba2995a51497 SHA-256: 087260f2cdec7bbbfb7f18bea26899eeb76cfc3650c93129ae3ebc43d8359ddb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=andrew+heywood+political+ideologies+pdf+download PDF link annotation
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223c7a0cfb---92053746115.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/susuruzosa.pdfIn PDF document text
    • http://emannsltd.com/userfiles/josagefaxotivamis.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f9bbe0a21c84e485ff2845e0ecd3da1/tevumi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bopnkg7f7e32r054mo12i0ukjm/gawojamaz.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6a99cac1cf669350d354659021080714/75948639869.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/tejepuvijajozuzezenutoza.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ca1e929---35369026827.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/80760801576.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38733e099d---88852033550.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/dogunotugefisewadasavuwo.pdfIn PDF document text
    • http://jrjohnsonfamilyreunion.com/clients/0/09/090f04f22b165063c0e57546eb93b169/File/tuwawizilojikakibizi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/042256352352.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/82953215387.pdfIn PDF document text
    • http://planetamama.ru/files/file/parilusamo.pdfIn PDF document text
    • http://hopkim.vn/upload/files/6395618140.pdfIn PDF document text
    • https://lasanisports.com/files/lowinigawevonibute.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/8034457303.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/d1eeabd9128b11d162b9cc23d1159a00/kamixuf.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lobijadukemugumipuvolunu.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/lisusidejupupewaderal.pdfIn PDF document text
    • https://luminex.pl/upload/file/lijinaloxorijaduwurajivik.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/maxolibeseledavekuwo.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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 16588 bytes
SHA-256: 74b43788eb9c5c0e9002681426dfcd95c722faa5b74e8795baf4a8c2d0b6b48a
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 11080 bytes
SHA-256: 56e13c876254186fc79cbf9db4b00c2f433f851e719303189f5818953eff8909

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