Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f10509b0996270e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 18:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3676b2c268eff280874a7ab061c10140 SHA-1: c35e0432873cef50281fca080ad0bcaaeb549b96 SHA-256: 3f10509b0996270edc756a9a6978c59c6a8716d41264021eca736fdec361abe4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories, 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 distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://carrasvilla.es/uploads/files/wogupovuvesa.pdf In PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/27760233181.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/huu1kehddj0870epevlnjifscn/fogavivowafi.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/fomomulivosupazakoz.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/907d3aeb26fa7b69d9257c0b538523ea/15857690399.pdfIn PDF document text
    • http://mospolytech.ru/storage//files/mosokawiduvabo.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071abf05c393---89466551244.pdfIn PDF document text
    • http://renovator.cz/files/file/vasopiwoni.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/73324210409.pdfIn PDF document text
    • http://ceroki.com/image/files/kawoteralebakefuxa.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gasozofeganoj.pdfIn PDF document text
    • http://alcantara.cz/data/file/wavokagudubisu.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/17535298634.pdfIn PDF document text
    • http://metall-press.ru/files/kitugazasutipijet.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609493df978e7---gijise.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/82828682867.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/c1m4l87c2m5ibkhlvi2qpjoof1/78855240385.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0p995ec5g760p5a36r0726bf29/barizi.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/72649703919.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/dobowese.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/relofipotadexasozo.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/34147878382.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9b0b8d404---4005036752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=seasons+worksheet+ks2PDF 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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 17756 bytes
SHA-256: 77222fd82b464c8fe6db8abaa8d889de762a19ba46517d35cf63a1169e7c85b7
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10440 bytes
SHA-256: 9e9c10f2fc3b0114af74eda2ebd536a026d813cfca3202af4da2dc90079e2abb
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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