Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3d501682d3dde7…

MALICIOUS

PDF

98.1 KB Created: 2021-08-12 15:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e90d3c47bcb1e97fecfbd7d696008267 SHA-1: bd9e047be2be72544d2ce42be6085a573aa6ab11 SHA-256: 2b3d501682d3dde77222de34e6104a8d3baedce7a13c86857d5898f8329bd639
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or malware distribution vector. The presence of multiple compromised CMS upload links indicates a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c7f946478---nukipadetunesopuxivexaba.pdf In PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/21922911830.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/vaxididezuxenuzuvawedutov.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qnafi02vpud5jtfacas0j9mfln/62852127769.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/99fb459096afd075e274a4a31be4baee/vofel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28777108da---teviletoxukuwimu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/c72bsese9e1u8658d82jkei7fa/pegamev.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e288913b---wopupakibodegosuninun.pdfIn PDF document text
    • http://builderall.info/userfiles/file/xugaxufepegoramofadije.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/9819530303.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d3b723ff7---biwix.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/43749998429.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e26b577e---64699827902.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/39805202234.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a67046b920---losimovobunetigekatoja.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945ace9ba17---68580987322.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/wajujaxibutuk.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/71423592771.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7500ba783cb9247f952c1838a4238892/90509705548.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/zelikoweja.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/66372951760.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/vafetidafofigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+the+hypothetico-deductive+methodPDF 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_off00011dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBD 10836 bytes
SHA-256: 08bd7ac88a41c02b75374f04feb9dca2f941694536e3a72eb778de9dd1d4d2f6
font_01_sfnt_off000136e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF7 16664 bytes
SHA-256: f571f8507d7797086ebd7e1723e033c6b5712ebf6a5b9bb2c1834bf781a70ea5

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