Malicious PDF — malware analysis report

Static analysis result for SHA-256 86834dab26a80d8a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 14:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df7698516e506d1a2927cac6a97367e7 SHA-1: 1b969da7f60f47dc89f1690bd6222084b64f6442 SHA-256: 86834dab26a80d8aeb2a98008ab155235adb2c4eccd87bceaa42880de4c00218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://tjtvina.com/Upload/files/wuleditagazisowikekuwilab.pdf In PDF document text
    • http://parzenica-bialka.pl/userfiles/files/wazasawak.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/demivarobewimitire.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9de1a7322d70c94dc626d8745a7af8cb/41224361942.pdfIn PDF document text
    • http://keacg.com/upload/files/waxomevamafanetitiw.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/68974036843.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kafazasofufos.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/48261366383.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f821167b42e---kikixabavemipekejobu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/38241827703.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb3ec5aaf---12755843347.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/sowur.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb0a62335---98700954552.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/66760139564.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/dazubexurapawulu.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/suxemimerugiropenet.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/80ca4cc27643c06e4dd3473cbe99c044/zujuxogedixub.pdfIn PDF document text
    • http://mebell-city.ru/ckfinder/userfiles/files/wuxujuvapafidesoju.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/76514582211.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c237f0b0185---lulowazitu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/32662506613.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210817115907_fhwupv.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210827141446.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070abc4df2ec---bakivenu.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/relofinuvaledunutogupew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+joiner+software+onlinePDF 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_off0000c605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC605 10564 bytes
SHA-256: 5efde4d1fad699d00270a497ca03cfb6a31d55d01c2f5d78bb8bb788f1585cec
font_01_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 17648 bytes
SHA-256: b37eda15d0278b93077093c129b1e22cad6c8a5da5ffd972ce1c2a039d97d0db
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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