Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f66b5a3b26f19e1…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 03:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce4be129c83a22ac07eb9cb515ca9e3f SHA-1: 432634938632c91e528f6185623455a5e5f8e24d SHA-256: 8f66b5a3b26f19e15d7d356aaeddb7fca3454f4094ca87636ca694df934ac399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised CMS upload directories or disposable hosting, indicating a potential distribution or phishing scheme. The document body is largely unreadable binary data, offering no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://detectiveoffice.net/userfiles/file/13258902880.pdf In PDF document text
    • https://soechi.com/userfiles/file/wujeresema.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/93608126458.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/99794543496.pdfIn PDF document text
    • https://loyd.rs/images/file/nefap.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/xelujatuwuvegimixejan.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/lesineneto.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/83846999387.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/govifimubunega.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bac75b6bb---44301589818.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613276ae86f3c---woguben.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/46291744165.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/85007798333.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/17687020130.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75646178090.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/7470747679.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fedf8cc078---57033901856.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210909073828_6496241.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/puzetotofaw.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7185e8c38e648328c4ddca4b7397c5d8/torakekimopezitawiz.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/28933476070.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/45008841660.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/fosoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+android+games+apkPDF 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_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 10660 bytes
SHA-256: b489731700723596ad805ed934067e205b2758bcfd4265d023c5f8c52451fdf3
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 17616 bytes
SHA-256: 84740de37b0bacc4332ac529d4545fc7855fa1d21cd365191772d4165a3582c3
font_02_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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