Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2cff2b1369e58c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 02:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4e92cc3c2a173b93adbf109ad134c359 SHA-1: f592847660a5a65e5d689d389ce5dce81f15b788 SHA-256: 8f2cff2b1369e58c7e254b5b5dfdea033ec0778c4beba98493230a46521436f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS upload storage, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a link farm designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://vanphongphamhienluong.com/upload/files/gosuzozizavemowujuwopos.pdf In PDF document text
    • http://lauraestetica.com/userfiles/files/fowinemataporobu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40676600727.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/22825096512.pdfIn PDF document text
    • http://proart.by/media/file/77911476947.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/14000647835.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/6886833215.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/7347089410.pdfIn PDF document text
    • https://mlspoland.co/files/file/43081161064.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/lanuwugisezekuzu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ad79a9917f747c4fc4f415565b92e0b9/kuzubotokuro.pdfIn PDF document text
    • https://adium.ru/userfiles/file/83987501093.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/zewesetifar.pdfIn PDF document text
    • https://jotelek.hu/files/file/fevutijutukoxipifirar.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/gamevufowanawe.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/tijazozekepisebiwi.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/63593498844.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/84640228040.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/podicfc5jffko38fcqjj43vbsq/11304369525.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zeked.pdfIn PDF document text
    • http://trivio.it/userfiles/files/41534070978.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/musujeviporinitusobikemu.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/68808321472.pdfIn PDF document text
    • http://sbkf.org/files/files/falutaj.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02e993ad6---tekajo.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/tuxusomipozuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=unturned+xp+idPDF 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 10100 bytes
SHA-256: 45a6a85a2eafc5cce7c437dbc93cc9a6771ec61762d624f6190525cba4d3ce23
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 18044 bytes
SHA-256: 7161b4fcf6fa589a37f442e12d495e56cfce7174cd864ff2ba1ff892c7df0c75

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