Malicious PDF — malware analysis report

Static analysis result for SHA-256 b230560979faf512…

MALICIOUS

PDF

76.7 KB Created: 2021-09-08 16:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 38a2b6c9bb1a7eb1c6a8307855ea622f SHA-1: 34a693c9a692a2b5044fb404a80ef3a2b4e4c032 SHA-256: b230560979faf51222e32c3c96d456d2f2700c97239e8f789de08143f648e5ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lead users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://farmaciacogliate.it/userfiles/files/vobev.pdf In PDF document text
    • http://zespolbahamas.pl/zdjecia/file/kizibodunupadonojatukut.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3afb8d4c---sulimu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dcd7a3fb7---46299241115.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/32927301534.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/98806097466.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/toxobevim.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/64510249537.pdfIn PDF document text
    • https://schmitz.cz/res/file/webizegedoteno.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/vezixedegidedimisutunal.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/bamadufe.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/loroxixudurorasusapomotev.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/gitijirazepanefudasu.pdfIn PDF document text
    • http://onlinevay.com/upload/files/xusanavoxoki.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/jobuv.pdfIn PDF document text
    • http://tchid.net/userfiles/file/45879758510.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699db140af---85575484796.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/bidonewepe.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/14757769376.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/maxona.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/73673904913.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210906203113.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kajojemububugafazomifim.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1151644fcd8408b123055bbf79bd8af4/69955111976.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/26045698523.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/67337720580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=chamberlain+klik2u+universal+garage+door+wireless+keypad+manualPDF link annotation
    • https://easyown.ddproperty.com/datas/files/12098563951.pdfIn PDF document text
    • 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_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 11488 bytes
SHA-256: 82e8371ec3abcc84b9440603de572f20a9e10f24cd8eff00815a2f483e7541c7
font_01_sfnt_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 16356 bytes
SHA-256: 0365e89b40b8b7beb15e58e160d6c485cd36758b65b21c1fa915d5cef42476d7
font_02_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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