Malicious PDF — malware analysis report

Static analysis result for SHA-256 c267b1151d96fe60…

MALICIOUS

PDF

73.3 KB Created: 2021-09-01 20:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8fe0817e8e3de88207d6339cf5b11633 SHA-1: 21fb2d99f22d94341b46f2afaee6312c824f82a7 SHA-256: c267b1151d96fe606a1f0b668e70725218d9c5e4530c1018412bad3a1fd3bcfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous other PDF files, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://foundryindia.org/userfiles/file/74384686203.pdf In PDF document text
    • http://locke-3c.tw/uploads/files/202108202233474152.pdfIn PDF document text
    • https://immobilgold.com/file/xuvakiwowubobesorol.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/17881983459.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3ca218308e5895dbe87e5f27a7134db6/37389787369.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nulirogawodigavibi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/99680012458.pdfIn PDF document text
    • http://vinmexindia.com/uploads/suwuwiteguzu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ad818cef071---41278190847.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bb53c1849c---bozij.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/de68cbf25988ded7fa205623fa075455/belit.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/60496194056.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/43c8032c17ef2e13acca9894b2d55928/20596055760.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/6306000316.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lolsc7i96dktgi1cdncrn89n6g/20735961520.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/37465240407.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/21651818408.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/97524408851.pdfIn PDF document text
    • http://pvhs1980reunion.com/clients/e/e5/e5e9f74eb83211af097e98bf68d59c4c/File/48405168248.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/juxitebafilebofosi.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/mezolu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01f197ea81---ravekezizesenizumiju.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/regojepudo.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/fusowej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rule+3c+of+ccs+conduct+rulesPDF 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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 16928 bytes
SHA-256: 0f9b06abe74cc6e91aee0c5fcbb2e13bff54a339dabdbf4a5d0924d06cd8da67
font_01_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10532 bytes
SHA-256: c27eadbf3479c6dc15c6cb8faa499a95feae33a31cd09eeaad111663e36a01e4
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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