Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31a78bcaf572614…

MALICIOUS

PDF

100.9 KB Created: 2021-09-19 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9f6f160fd4715f81b8640fe51e5d559d SHA-1: 615cf8d23c0bf1ac594afaa4fe4e0dcd956dbd62 SHA-256: e31a78bcaf572614054a171055a0c06f40134b0ac8262699ef00fa02f376a2d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/09r31qs21580t7nfa4ie4gacbj/kavomefowovubinetoge.pdf In PDF document text
    • http://gardatrans.com/content/Files/xazudux.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/57833402614.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/45991709030.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/nijajotesogisabo.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/22369869833.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/nidobo.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/73801812849.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/91613127057.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/83137201586.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145a945a755d---55191815784.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/tijivebiserog.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/34454656711.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109171558336039.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/pijufore.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/warekivowejegepolu.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/74408098713.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/9178ed9adf86c2a2e99f94d06f4c56da/2589698821.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/piginozefegigogukevem.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/wetajepebu.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/jukarugazubulomidedebor.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/29113808886.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/sulubi.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/51607762243.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d01366a6d1---wukupaponazasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=beauty+and+the+billionaire+lauren+landish+read+onlinePDF 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_off0001223d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 18988 bytes
SHA-256: 9ab992e1d8a8b666ba3b10c1e82fa0b4072807be60cfe1ec59031bd203bf6f3d
font_01_sfnt_off000152a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A8 10752 bytes
SHA-256: a3e43295c997e5bbb12a3b5c0635ce8ad9ae32436675b53a67ddc95a5371d5ec
font_02_sfnt_off00016b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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