Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5e1fbde15aec32…

MALICIOUS

PDF

94.4 KB Created: 2021-07-14 06:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b5b804e8036fec957becf2d3aa33a916 SHA-1: e5785a694bb108316b25cf8e7dafe6efaf1b18ba SHA-256: 1b5e1fbde15aec32ad4e4de73ce5cb179c87ebbe56a33106c8726838d69d18ed
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various websites, some of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous external URIs and link farms indicates a likely phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://thermcom.cz/userfiles/file/21063758188.pdf In PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b47934cfb---befewopanufajebefobife.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087487d28190---loweleve.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/pored.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/zikumuxusudini.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/lebofibukasodibitajexor.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0c061c65ebf7856ae8aa37e014d76450/49648329904.pdfIn PDF document text
    • http://bscartridge.com/pic/mimubikifaxaken.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/73d8cc9464c5477d8ce29a2fcac541e3/kexomolixodavonof.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec004aa8cb---10962912028.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae0130242---18083402895.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/tq1tlp2t5qqbsp4f7omhma3juj/34772749744.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/vonizovojorofokinim.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e168f395a9.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddab5093d---88911073211.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089a6438e0---buxoboriwugo.pdfIn PDF document text
    • https://areicon.com/images/file/43128485670.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32a05a25ba---sifidutukigol.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/46482287635.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/69953035011.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb1e2b659---9638186262.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/89f40e4a32f9a3e240c38367f99802b3/mukujifizofujejusisiz.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/caca07389946b82a5ea183b6fea4ea38/nofenuwezijetun.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7f88a85d67e7a0076519389e63156525/75150888042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=iced+coffee+maker+black+fridayPDF 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_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10564 bytes
SHA-256: 577a3df91c85360c7f7f9eeb7443dd8dbc951d3bfa1db70f431b73b92d7d881f
font_01_sfnt_off00012659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12659 17700 bytes
SHA-256: 4db306197ea8ce4e67dea546f0eaf38fc9d397b9cffacee1e74c743b62ee3d4c
font_02_sfnt_off00015475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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