Malicious PDF — malware analysis report

Static analysis result for SHA-256 8703b617edddae44…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 20:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b66642629339c9e481817ecfe871b9a1 SHA-1: d8d8db72d3678be7c162acfe06bc12f2bbcb58ff SHA-256: 8703b617edddae449a678f04f4faf2f1cb34c41ad1b45a3dfbbfd543fa3b2cfb
176 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yingtailong.com/upload/file/210917122227216907gjtmh03u033p.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7a91528a---27738192153.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109130604472788.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/butono.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hr8e1bjte35lg4cjiuv40madee/ximowuzoxewulerowinenu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149f2076f2e5---mivej.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/64091926961.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/61204449702.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/xuvimomupudomofexij.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/sutakipiturupiborugap.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/6036695692.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/fesotikofafelej.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/62986481327.pdfPDF link annotation
    • https://www.esfa.bg/root/ckfinder/userfiles/files/puredalejupixagutekog.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79886345707.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fizokupunasexoguw.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/fipaxererazeguxotu.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27775246310.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/voboredaw.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72518447109.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/14123718700.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/35647967738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=play+store+apk+android+5.0PDF 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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA44 10912 bytes
SHA-256: 796b1a5a2491be83a7296cabcf6558c7271644c8df62c9594df70baa3aac19fc
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 17316 bytes
SHA-256: 78794bc38c62555b6485460b1b7765b1b67e582f5bb53621220d26803c128c43

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