Malicious PDF — malware analysis report

Static analysis result for SHA-256 393f38e129fa7cb3…

MALICIOUS

PDF

73.8 KB Created: 2021-09-04 00:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0e5c3733fd3621ecaac1bb22aa45a43 SHA-1: bc5077c24a68d5820bb3d2e591c07e4ff86e2b08 SHA-256: 393f38e129fa7cb3c91db6474f4dc27a3b77bdd1672ef3a49ec96fe2a445a3a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=collect+and+organize+data+worksheets+3rd+grade PDF link annotation
    • https://dveropolis.ru/upload_picture/bovuwebilirigebesixas.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818e48b30ae---pasawew.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/taxelolijiloninebaxuliju.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/mudedifuxobujolefiloju.pdfIn PDF document text
    • https://infotechbg.eu/file/dobikivi.pdfIn PDF document text
    • https://ivanamihic.com//files/mofokumolipanuzanet.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/maginufutuware.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/92a782d92508f5c1118151904d85ca67/78708206464.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/38411382702.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/morewibavubizo.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/6rbtj7e3ke25tr1pb5g7rlquv4/90715646840.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/7487823273.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611b3b032de4f---54511330021.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/69517653772.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/zoxufidiket.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/1487376061.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/24696772373.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/9530603307.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/sikidifemazizilux.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16090e96b2d602---rajisije.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/rulom.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/95621675135e09f78fae74688413d1bf/somepo.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_off0000c150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 15204 bytes
SHA-256: 82f29a14e74d1dc9b15a25999735b777f020a602c803061bcc16bfe3d9caffc2
font_01_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11092 bytes
SHA-256: a3626f49d80b49f81fcf4e3e05f3528bee10ea1317ec5c80ae4477a8c13b90c3