Malicious PDF — malware analysis report

Static analysis result for SHA-256 efaa805f13c9f4da…

MALICIOUS

PDF

84.5 KB Created: 2021-08-21 00:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1eceb0ba53243adc2624af135f464919 SHA-1: 2fec41eba12441ef061ea2b6040c070b3dcc9927 SHA-256: efaa805f13c9f4da05070d1e94873c6fa460a94912b4c1c2e1f9dbbf70f0e296
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF's structure and the nature of the linked URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.masozilina.sk/ckfinder/userfiles/files/15491408283.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tkqfvd1v7hftpocotfvhid958s/vituzife.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/10862996079.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/33999991121.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc104256ce---rirajenufasaso.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22e773f5f0---jezavifoxam.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/62484197595.pdfIn PDF document text
    • https://pindimana.in/uploads/file/25553806820.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/e57160f0987ebe4735a81a2b530346bf/wazijogamolufokaxajamozen.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/63733879738.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cqed32ciddgqcqhs9ne2sh58tn/3775238774.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c6ccb1a4---revefabepumolakavenixikaj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e61f18dfe---gizinomerujojufilumixe.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f59893a9755a301e601a3b3dc8a1b4a0/xujisexijubidexusirilu.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/ronojukalopinevulojavado.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4285c01d757abb9e9f63baa7e221c51a/18286130200.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/3m5mt3qo86gb7s7lt53o7a2js5/28009024307.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/vabusowan.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/narumamewunopojewufoxow.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/7927948521.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/bewagivikenawusovexolenin.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d673b8a1e---39765485163.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bbd0kihkkm84f2pr0i46e26ab3/43314567648.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0900391f8e---wakexaxiwumexisubixuxuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cuanto+vale+el+platinoPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ae6f4a13adda12e75c583e313972afd9/27610776072.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_off0000e567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 17804 bytes
SHA-256: cefeb6b6ebe12b2c478ef061eb16884ccc61dfe6523aabe0c440f42d7b1dcd94
font_01_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 10172 bytes
SHA-256: b1a24ee20b6d73f5b693752e1728f552aceccba4810255a3ab323ef1aba5b1e5
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1