Malicious PDF — malware analysis report

Static analysis result for SHA-256 8401ad4833c7ce15…

MALICIOUS

PDF

89.9 KB Created: 2021-09-09 22:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc3235537955450c2cbc919a0bf8a3e7 SHA-1: d71593c2ad31d969e7173ba8bffb1ae6e3114cf9 SHA-256: 8401ad4833c7ce159f26d3e1966701d7e2bf038872309d9aaf5ccd406acd3d2e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://saigonford3s.com/uploads/2021-09-10/images/files/10179754370.pdf In PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/kefosudisag.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/rigexikakiripuzab.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/bodirujanixugexefow.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2de9be5---kejalodifeku.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/37591704621.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/fuwox.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/jimabevumonox.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/sozukodovifetabomi.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/90034622331.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/73561706567.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/26994135512.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/movugoxuverodajibak.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/gegasa.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/69379168097.pdfIn PDF document text
    • http://sbkf.org/files/files/losigorabuzeve.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161311f121ed05---xinereseroxafataletigak.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87963558995.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/narevoteganiv.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad79a9917f747c4fc4f415565b92e0b9/kuzubotokuro.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613615dbe0b62---62698319427.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/vigonekibiretagirazeto.pdfIn PDF document text
    • http://freetds.net/userfiles/file/boruvisabotafulekuw.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/sipobek.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/reladosiposupilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+just+the+3+of+us+full+moviePDF 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_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10860 bytes
SHA-256: 32119984c4f187aba1a30adbd041372af01341024bee13a68211aa2d6e943a4c
font_01_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C63 17596 bytes
SHA-256: 75fa1e7983ebb5599952cd47d9e56d966df8a8035276d62c651edfae3e246778

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