Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7bf461629a79e5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-07 02:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd718133e6ebd878526181a8750529f0 SHA-1: 63f1590cc493c08706a5b6c6444c0f8e69a0649c SHA-256: 0f7bf461629a79e59555a482127db9ab5c548e2ba68b30fccd9564a5c7da12ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and 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 distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host and distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611bf7238499f---34411086035.pdf In PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3e2081790a1d1ce10f38eba3892b18c1/37492349764.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/rirevojudevifumozuno.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c28c898debe---numekufilirusanekivakes.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be346e27839---86921032681.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be4c8592bc9---pikanav.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fba089e6d---mivilokutopixumomot.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/br2qjb6tavqsucourun1vt411l/pojujejuxexagurij.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/vinoteruselubupeget.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/bowosasekezuma.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vumopokotekuwol.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/sc5p7e0j10ghur8nmpjn8mkdn2/vowik.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/72008418601.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/xetowepopanuludamuku.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/36869890254.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/3dbe9536ee18f5a6c1b6e29606c82c05/benujesevavofetax.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/l47mc9g9d3gltmvqmlhnvsor1n/bujoditiwitat.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/zawugitutakizapid.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/neligewulenag.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/81818968482.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a1fdc64b8284b36efe8ad6bd02c3b9c7/30818428177.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6d8396b2---26162399363.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085232966f1c---2602523775.pdfIn PDF document text
    • https://agrando.cz/files/file/wasobemetisewa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a633af62ef6---37649672295.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/votobovirupapefinabutiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=geotechnical+engineering+1+notes+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_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 18204 bytes
SHA-256: bbf4cf5e7ccaee42f4e868909af332a873042e615da04564b8cb0e5f92031b08
font_01_sfnt_off00011529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11529 10988 bytes
SHA-256: 327b8f2a366154aa25d8c83776747d6441d6e43da6be3bf5e832151e3e3cecde
font_02_sfnt_off00012e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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