Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccf2e00f2e435bb…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 22:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2df057be48e3f12570d25f28d1720230 SHA-1: e0229eef46f38540769f6451099f039c42fdce25 SHA-256: 2ccf2e00f2e435bb8d514984b690a1156af647905f37784fdce1f075a1477200
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the structure and heuristics point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://advance-pack.com/editor_upload/file/39791787211.pdf In PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/637955f718a7da6b4c42f2a3d2a4bc31/vuriruxuzijidenoxojavaj.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acf23fedc1f---vofikejodi.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/79082709528.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/30592635321.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/86821587375.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4262d0a5---604957060.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8ebbf866a4ba46003c24145c2c443f7c/zasajasotowupilab.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/18e91e22b60c06486eff3e5307b5425d/vixonazunizake.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/mulemi.pdfIn PDF document text
    • https://coevent.ru/upload/files/nesuk.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/dasaz.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/84718683416.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/77838855880.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lafebogudoli.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/h059c30p3ga8kpn7fp6e7uuiic/84282118091.pdfIn PDF document text
    • http://guitarenko.fr/img/files/82639918393.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c684308909---walovipomapuvefowuli.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/58691505825.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49464519213.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f914799da50---gixewirujezigisonimuve.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/24bipulov0dvi3q24slgj14hr5/9395806874.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/18303757335.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad920073ba2---kalalokipawukogazix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pink+cervical+mucusPDF 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_off0000f275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 18380 bytes
SHA-256: a4ad7fff058810f4274b2e09b49e170f0c86c144e35f9a22ca763691f232a200
font_01_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 10432 bytes
SHA-256: eba0349201341b3055973eee3f5781e7d92ad19902ab18c6635a7b79be667022
font_02_sfnt_off00013985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1