Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a705de757eb1b0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 14:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6eef3759954f54b5cb4a4d10a3efa98 SHA-1: 38404642ed5615bcee398c67de12fd0a75a8b74e SHA-256: a2a705de757eb1b0fc1d1236050de39c227e211598437df721a64fd8476ceeda
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URI heuristics further supports the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=android+bluetooth+service PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd38fc45eb---jezajexumipatuwudex.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/nudanunoganero.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/wenitojisifogapavejudov.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/15086356570.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/74291228246.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/tiwufudut.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/87542745020.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/genidasavudilulagisowo.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/sawuri.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/2bee896d8d7de4583e1fe65b39d4125b/fazebede.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/32361014326.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/mewawigomeruxoxopinuju.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/11951829487.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/bifigejax.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210918181700.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/74751168513.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613babad9c6fc---zudaxixi.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/48806255643.pdfIn PDF document text
    • https://tch.lu/files/files/88186851617.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/111159597154.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/86445380352.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/nomuxiromowulewosufekegix.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vesowavazilawifotagufe.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210915225709.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c92001cb0e---64018546561.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_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 10592 bytes
SHA-256: 85a899e921f945227b830822e5461d7ad544a03c28e6707d0f6f6ff70c9dcfb7
font_01_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 17700 bytes
SHA-256: 87f6d5597a74743cf20d10f71ac108ef9dea6c3e25d1cc226813d64a9b3a1744
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1