Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f69160bcbfcba7e…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 15:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e39dab35dd8ef7d6c8e6d446b1b92b4b SHA-1: e009022da8617ad7f474c5db6c382040dbb04174 SHA-256: 1f69160bcbfcba7e3c8ad6f68aae515bafab1c3c1aff8e0957ec21f677214e81
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=sniper+3d+diamond+hack PDF link annotation
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/ef265214e71ee902f14e12b0e630e6d3/wakiluvuvesow.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/69801959526.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/basatule.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/8386939259.pdfIn PDF document text
    • https://fond.ru/userfiles/file/rujelejujoxux.pdfIn PDF document text
    • https://eklyps.net/images/file/47205982492.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/93858059440.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/ruxavopapijudozewus.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/sijosomame.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/torajunasebu.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/mikamofixikuwaxi.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/71945106141.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/3617445833.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43637154316.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec8823efd2---lopazed.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ec9a7b312648ac326c9ba7ec837718ac/90928629254.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a849bd25---53429669681.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xusuzuwekomaliretu.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/zezoz.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mulelopux.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/xozisavidimiv.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/21788536484.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210906133119_699061.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/gosidetezaluselatujufamel.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/29648807645.pdfIn PDF document text
    • 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_off0000e601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE601 18776 bytes
SHA-256: 470f387050134baf68ef19ec8a3e50976d7c323f96cc4a3458c6304e870554d1
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 10808 bytes
SHA-256: d0ca25bd1c8a7e56d05086d3b1a33dde8ec072206a9e530223837eff4b483f89
font_02_sfnt_off00012f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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