Malicious PDF — malware analysis report

Static analysis result for SHA-256 a105e9e5b2986234…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9c124cea07783ad48f3ffdd52c3cb762 SHA-1: aacd2b6d914c1412893fe669dd382e75daa24241 SHA-256: a105e9e5b2986234fdd4e08f5a44d028dc87b198c80c07614bbe2a2f4432cdd4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://re-media.ru/foto/ck/files/57882006306.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/laribejo.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/wixolujamatujilosapofesu.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/fexaretegagubavojavu.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/77927971877.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608947d339c0c---5804062428.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/41ffdf41173474bdbf32790d789e23b4/84892005869.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/29667322646.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/18164443599.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/19423995933.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/babakolebadekogurele.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/naweleb.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bf7840643---jezujovabivunuwovup.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/23914212614.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/3296548165.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3d35f856b3a190cc4ce46afcad960505/roripevusar.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c929064391d1ddde4ef0ef9685810ef/12726686326.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/7d44e8fd2f2d7bc5d67a45a002137a2b/telalaw.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/raneluriwarimemufi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba45e22cbf---58313647368.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/22553444926.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/gpjds7hptep3imb1fbasfa7efg/86685958189.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f672fbc4a95abee37bd9f0d7a84ba060/xopipovojazoxe.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/peloridumiva.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9075764c---lipopapakevuzibaso.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/97691ebfc8ee997ec35adbae9caa9017/77469420759.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=properties+of+rational+numbers+worksheet+pdfPDF 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_off0000c461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC461 16756 bytes
SHA-256: fbbd2d48931a70adc243c56d3cf878696b1d7eef9e28a58779563623e5c0d9f3
font_01_sfnt_off0000eff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF9 11180 bytes
SHA-256: 8077fdd8a786a57f1b98e320d33357e3fcc94b6f3d1dab82bbb8b1c3b056afcc
font_02_sfnt_off000109c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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