Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1c3465900d8f84…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 15:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a314a40b681d6c22d8b656c53906c7e0 SHA-1: f1c5ff739e314a9f156a10d27bc7d56ffceaaa4f SHA-256: dd1c3465900d8f84d30e2ed4498a85187dca1101929929a90f2f8450a24cde96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161307039410a4---32190968558.pdf In PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sakidodinagosuvati.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/nigewurom.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/72696646626.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a0f6aa85015afcd6a8d822484dae08e0/73035696197.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/newezosamonarajofami.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e3i4aoebmflsdnp095nr6rmi2i/83012348225.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041448253381.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a6fd2a893---23644352148.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/72956712831.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/9976092458.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/diwiv.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/18347331619.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/a16c0a984d073f2240836c5edc2ba329/midamizenutoxojasi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418d7a5eb91---11512121360.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/39276828287.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/55476203838.pdfIn PDF document text
    • http://gro-felix.si/uploads/xodawasirifi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090223460473499.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kupopurokuwuke.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16144dd98e7201---51738745761.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/vaworijuvidozuwoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=car+drift+racing+2+pcPDF 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 17220 bytes
SHA-256: a08a887bffb27c14267628d0aa5177e4088be468a2a06475c7512a908aa1c2c1
font_01_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 10480 bytes
SHA-256: 90635eb71cc07ff754d7520bef15c506bda56e9f25eef13214dfeb65823968e7
font_02_sfnt_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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