Malicious PDF — malware analysis report

Static analysis result for SHA-256 643ace95ffafb170…

MALICIOUS

PDF

82.6 KB Created: 2021-09-17 08:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9babd8c0ee6d8a725d0d4f269328fe50 SHA-1: e05372669593132b410f8b44b4100561165daa90 SHA-256: 643ace95ffafb170009530fe5cc08518aa9095bf2f7f03c4302ef3807d300126
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. These links likely serve as lures to trick users into downloading further malicious payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=transfer+photos+from+icloud+to+samsung PDF link annotation
    • http://pinedafoundation.org/imageuploads/file/59993527132.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/87365848231.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/48121042064.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/66791137327.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/77920659548.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/fokujujuraniwofofexi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/6008545952.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/29622990375.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210905111503.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/90423329042.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/padakopavabebevuxivipeg.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130265666068---55613271763.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc3787022a1daba5c82415f4589e800b/wosivobusoratupadolebagi.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tumasavudodareliwujapa.pdfIn PDF document text
    • http://capableapp.com/uploads/files/gusedomusokoboz.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/42803601601.pdfIn PDF document text
    • https://kimcert.com/E/file/mefuparefowedawiw.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/jaziz.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/sifufam.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/68035254485.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb3cc032---17051067745.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/lokejavewitiwe.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vavadatexeloxoduxu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/ridefoli.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/gorolulavubusom.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_off0000d806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD806 11132 bytes
SHA-256: d021675656a595d5a6d1ddc22d8a560c7dfc039208f5b9fb2625ce9fb7e46945
font_01_sfnt_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 19684 bytes
SHA-256: 7193009580199138e05bbf06a534cade9eafe615ba3a9a3ab73e78795b89a94b
font_02_sfnt_off0001245f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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