Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff99ea4a7b8a158…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 05:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eda01501d20973cd3bfecbaeb742cfc3 SHA-1: 99e269c7f92a6db6ee278bae685b53e7c43d8f9e SHA-256: 4ff99ea4a7b8a1586afa1ac07ac552b19bb65a60d920a2c49ade176ed59f5a39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, strongly suggests a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support this assessment, indicating the file is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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 http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2ef950330---pawolaroketa.pdf In PDF document text
    • https://kawanmto.net/contents/files/15608984629.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kekit.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/9eff174a64b67a0b3b75e9d145d44cfe/96937738633.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d79236eb2---xewisunutumivefim.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/927c5ff39468a4622baffcf04df3a832/sojulamaguvejosodubi.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/14191654927.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/zibipojugawosujosivi.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sazokulefir.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/2688887459.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acb07ccb642---xifazeku.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/zigebakige.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/537d3397cb83630d08b630c8e8122baf/87886683980.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/f3c073bf6f0024d6b07952a6ccefa650/noxuturinazuropekan.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/detupax.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/27554242361.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/vadrtbk53dhla7jhgk6kj8h6v4/wewugatar.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/zowavef.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/52335164288.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dda9546614---futumeveliv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p4ue0bqnhu3utu0e38j9t21kq5/xuvopevemezolagevunu.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/59946355934.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jawejusezeperurodaki.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111707ed8a---63507586070.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee7363c5f2---kiwisizujimituxovon.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/biziwonidopemibejatak.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/29874461013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=multiplication+word+problem+worksheets+grade+3+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_off0000deba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 18596 bytes
SHA-256: 04390204910ea70ddfde450365ea079aa6d369114da56792e9d540671197999d
font_01_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12625 11652 bytes
SHA-256: c35f0d5f2cef6a2edf1a0c2ad8bfa73eb4f321226194964d989044c98121516b