Malicious PDF — malware analysis report

Static analysis result for SHA-256 6afc3d38d701996f…

MALICIOUS

PDF

90.7 KB Created: 2021-09-01 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52ef9e0a89b4b8d712ed646f306819d4 SHA-1: caedd23d18d0609221ed46d53dfb48d17f988b70 SHA-256: 6afc3d38d701996ffc2b017eadc49ad6adffac65653008f31dd742403dd93530
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings point to exploitation and redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ckmandarin.com/uploads/23420770649.pdf In PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/bufawaxen.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/38345431603.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e4986aaa05d01a83af976fbbdb48ffdf/7906638962.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d45906fa8---74667668649.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/38adff55d04ce1c491a48da9f4ae7bf1/91831104789.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7944083b---664971051.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/36385815109.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/wowerukudukuxunan.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/63500240391.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/merikusedo.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6b11dd34136535fcb5ee9d84064dd343/59467443114.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2246d6b632---selim.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afacaa277c1---62705179598.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b21c99331a83ed556b5081465d8ca07f/93019981319.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moiaovhld7ev8pl11rio14lukp/28090844679.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/450046e0d0923153aa7acb775882d27f/sudamozepava.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/wibovekowap.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/995f13072df184c92f46e91e7a072a87/roriwudo.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/gikelupovebepafotagig.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/30452610275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pc+cmos+cleaner+2.0+free+downloadPDF 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_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 23972 bytes
SHA-256: 3da8092d2f67eca65f661eac79aa7e7a2f450f8b9a06078b8232851036ecaa76
font_02_sfnt_off00014161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14161 10844 bytes
SHA-256: 3bbee0f9a7b0f92a9a21ad20a979f9564b61a5a130068f6f660f9f4c60cddeba

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