Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ab6aedaadc0d65…

MALICIOUS

PDF

72.1 KB Created: 2021-09-20 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2364b24678bb802a7aa3e58e2dd5d0af SHA-1: d9c846a1a2dc389657c2b5f3e000a75df6cc5db9 SHA-256: 43ab6aedaadc0d65c5d430ecd65577a9a0d7f3b05d4a6a2b4ffde2f0586cc4d1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=what+is+the+collective+noun+for+football+players PDF link annotation
    • https://open-call.fr/uploaded/files/83755385292.pdfIn PDF document text
    • http://mcutech.net/files/52047699716.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/puxojinovomotirugaroke.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/loparuxijeben.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/98402187125.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/63597019576.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/kigasavumitukesezuw.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/99785017522.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/56417564736.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/rokusijebedifoda.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/40531653170.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/bariwezolinofizeterew.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/zepix.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/45392074262.pdfIn PDF document text
    • http://belniig.by/public/file/wuvit.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bdb8de052472f4c33b823e77e10b4017/27473758790.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/18834687308.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lobemofanekubileni.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebfbcd5734---38825032341.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2fe53736b---42022994822.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/10564289544.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434f50769f6---pivabesirukej.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/17895765759.pdfIn PDF document text
    • https://buka.ru/sadm_files/17853887856.pdfIn PDF document text
    • http://ccsl.asia/files/39594537919.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_off0000b525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB525 17568 bytes
SHA-256: 59795500251dc0397067cf78cad36c63490ac48f2035ebf895eb50a9901d1062
font_01_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 10992 bytes
SHA-256: 2a10819b83dd7e901137dd60fba9c53021901be5de8b7917fa99d03a6b64712c
font_02_sfnt_off0000fa3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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