Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ee234525867b7c…

MALICIOUS

PDF

100.5 KB Created: 2021-07-18 00:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7976870d4a18f5ecafa641cce3f8ccbb SHA-1: edfa40505fcac8c7b57e863edbb88bdd841e4300 SHA-256: 90ee234525867b7c2b8f7db2e5079ce3aa71ffd3b21b5f31733e844638ad3e3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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 http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ui15516n4sq3o0n2f6eoqeoocr/dezawikavasakazov.pdf In PDF document text
    • http://kapsalonvogue.nl/files/file/piludirazalofamojusizubod.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r1qai50iaibrjp3r7b4vgcpnhi/93032588355.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d01c9d20179b73b8169e886b5d75d1c3/tasuretotukazasopel.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/14e108447123ad623a4d00dce32062ff/jenefemodoneziwupumapoga.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/ziralaj.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/29193120503.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/siroj.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/jufewuporobas.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/27398628370.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/63460944535.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/fa8apgp7rk37n7vb50bt16m8ri/rafijosofokubajaka.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/14526181215.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/godurosed.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160792fbeb0010---47897265524.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/rekitobavosizuxuji.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/3pg7kbd79kq982jfjep4b3mp46/banew.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842ebec6bb6---pepeberinaxe.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abca8b66132---95221286326.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d15d1c9d7---40188801790.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a9ad3b051---53280845371.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/gugavadidu.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/20370146045.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/noloruze.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210626_055004.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/banozamirakadusepix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=galway+to+kilkennyPDF 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_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 18540 bytes
SHA-256: 53d75a46c1f10f4af2a81729eb6725f71b440484c662e58d434f2c75552bdaff
font_01_sfnt_off000155d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DE8 10164 bytes
SHA-256: 5633f8f9ff02b2b191cebd3e59332343031d1f12cbde395ecb0e59376b9f0ee3

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