Malicious PDF — malware analysis report

Static analysis result for SHA-256 6264403d721944a8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-15 22:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3cc348c519ea1c27d1f05b23b71c6c2 SHA-1: e6daf698d9c3795199641daf15338dcd5ef51f61 SHA-256: 6264403d721944a80f57e55c8026ca12afd249fa228b40c546ff48d21044d73c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to manipulate search engine results or distribute content. The presence of ClamAV detection and ML classification further supports its malicious nature, likely as a phishing or content distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/47856615186.pdf In PDF document text
    • http://ebus.cn/up_file/file/87984353280.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/pusinufun.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/49916007979.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/8370577985.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/86779464548.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83878301533.pdfIn PDF document text
    • http://tdbm.vn/upload/files/jivujizulularejo.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e8a774428---midado.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/70591359989.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/94181805053.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f5b7c0d876d4e70602ddda1ac21ee697/96502236975.pdfIn PDF document text
    • http://arsvet.ru/img/upload/pularonugetenep.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/kagapexuki.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/15592422134.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/56385432999.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/66682041326.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c092b4b7---7577143373.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/tiboxebazezasebazuvula.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xumesanukivew.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100438014104.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/13823164137.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/lapejukagunusi.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/wubejusilipogesur.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/xunuxivokujinoxegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+surgeon+of+crowthorne+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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 16576 bytes
SHA-256: ff839feabf84b3ec95f182c63cab028b512d82f1950d352facc12715feff9bc0
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 10748 bytes
SHA-256: f2e80a19914f328316fe369b720affb9f5f34ea595965a3711d632d21b3cebd0

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