Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb47158d5a898eb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 16:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e9fb8152c01ad3a8b09f004e0d9c4aac SHA-1: 53e6a9b585a9cb59c0d38d982dc9b812f55677b0 SHA-256: 6fb47158d5a898eb0281ac21d88c50d825ba5123d0f959a776f101ab3281d126
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the classification as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://pusheng168.com/uploadfiles/20210904072225.pdf In PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140226f6f14a---janevisuxorivu.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/tabulanawuti.pdfIn PDF document text
    • http://allier-genealogie.org/File:/fidugobudunitobigebes.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/lunusaxuz.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/33578291980.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/papewuvivemutizuloripel.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/vizojigux.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/vedoforudisuse.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/xesorekalufagop.pdfIn PDF document text
    • http://tdbm.vn/upload/files/96503023269.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/dimidosesi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8136d572d---73144789182.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/43088005037.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109101430017507.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902031800553442.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/saxitabokas.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/fupase.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/bububakele.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16131938ae255d---bekegiwajeg.pdfIn PDF document text
    • http://trivio.it/userfiles/files/dalejanujuzegeniposomepi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1tmfto9qjf2di0d7783dp8tvf3/pudelusofutabupizuvotuko.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/49748806429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=live+net+tv+officialPDF 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_off0000d282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 17964 bytes
SHA-256: 0d1ab4e9eeb7d4caf121ba48b796c3a8c4ed6f0c9ede9457d2aadcb11dc43f1c
font_01_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B2 10084 bytes
SHA-256: ce569907a0d0f8485afd07665feb23c8c6bee9f18b1276fb64775aed6fb8f0e9

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