Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fba06f66b6f2ff…

MALICIOUS

PDF

83.2 KB Created: 2021-09-14 00:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e8ecf56c9b9efcf924fbd279f8ded0e SHA-1: 54bfb1980fa4b21a4dbd3a4de405c4f4a17fc2ed SHA-256: b3fba06f66b6f2ff3b5abdac8d965b77a3b70d73184bfe841e967239e6c54e57
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL findings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=3+categories+of+periodic+table PDF link annotation
    • http://maxidmum.com/images/upload/fck/file/rovigekozotiwojej.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/fulekometilubilexebex.pdfIn PDF document text
    • http://hangquangauto.com/files/dilikaxisuzitoxal.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/medolibopagutudiv.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/44318585050.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/jujizasomukenilaravoxap.pdfIn PDF document text
    • http://maxbrio.kr/files/files/nujer.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/46651988324.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/3910594201.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134705e83bf7---55683415484.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161308abcc700c---17914610189.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/s232j3jph4kfg07remftad93nedvsrl5/venipirupabejumugo.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/40424148180.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/pizujiwiniforafedijopudu.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/27604046854.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210906_161815_104.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/molusapi.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/midetagizubut.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/magekuzagigumivoz.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/gazozijadelinomofukef.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/jisebuxegajuvotowemota.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/livusaki.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_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 17564 bytes
SHA-256: ae333ca5de953ccefdbaa1082bff85340818772a64f4320797a843b361be43d1
font_01_sfnt_off00010dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10904 bytes
SHA-256: d4cbee78734ec9df1a04970f27b82536fbde7be6302b67589afd0ec0d9c5de4c
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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