Malicious PDF — malware analysis report

Static analysis result for SHA-256 309c29f9faaca4c7…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 16:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cbd768047fb44b32ff11580ca15f91d SHA-1: 9739d96752c3f9321d52a32156efc40bed7952f6 SHA-256: 309c29f9faaca4c79dad0361b66906640dedb8c124d388e9d5025901813cbe32
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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 http://homeopathyhongkong.cn/files/disiwemetixet.pdf In PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d1a33d60a---24479230022.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7b24c344---23139531834.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/97247394778.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/42691737067.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/letajejepejaduvudulamilik.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/84206443445.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6b6a13ba34ac6c642501df963a95782e/76152270342.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/10015097804.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/babinivaximos.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/59873075365.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/7874720702.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/b2eb645269cfeff82b6d163c0a197aeb/vizuga.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/zagomixezaragilafajox.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084b0415d6ff---senaravujomutiretesogerin.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/bipedo.pdfIn PDF document text
    • https://j26clean.com/upload/files/72763754818.pdfIn PDF document text
    • http://huiking.cn/uploads/file/261221181951.pdfIn PDF document text
    • https://hgb.se/filer/file/piwivipojoxavon.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b91d99af12e---fowimipowoxemejitaji.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/80532634228.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/1066f71a3487b0959077b66c27895c26/mumode.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/151b598e4767634c3c0eb6d0dcc59be1/81583602722.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/xadebufinufijabovodow.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607919b361bba---zemekixuvuduforokonoteru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=verb+to+be+interactive+games+onlinePDF 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_off0000d814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 10748 bytes
SHA-256: f260d7f3a85c960f283e0d8c106f98304914c3112dbf02b3b65d86b723ef8124
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 17032 bytes
SHA-256: ca7c7963395cd20abdcea936db38b9ffbbfe8f34de88ccb6b6ae376424b8a439
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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