Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d7a8c9b0ab45f8…

MALICIOUS

PDF

84.1 KB Created: 2021-07-26 21:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57652d9d313c55417e9c56578d2a088b SHA-1: c31b190ddcb7aefcf10e4a4dc4ed929b4b0e937f SHA-256: b3d7a8c9b0ab45f888158c2a10a25a409d32975c5373b5f14625d9689590b45d
184 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of an IP address literal in a URI further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • 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://makenie.com/upload/files/22764202691.pdf In PDF document text
    • http://domeinbeverdonk.be/assets/files/file/47039184593.pdfIn PDF document text
    • http://zzweien.com/d/files/sapeboruvopufumas.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/73680075262.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609627a06b414---raxogoxawizare.pdfPDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/57541245665.pdfIn PDF document text
    • http://101balkon.ru/upload/files/55828134486.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63668311968.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14927c88b6---tatip.pdfIn PDF document text
    • http://cooperclassof1970.com/clients/9656/File/81745217287.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b4476894---36114688855.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/89210208719.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/837b2696bce21388376039b337beba0a/96702085477.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/84001775733.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fafozesalosorikosilufor.pdfIn PDF document text
    • http://cy2hand.com/userfiles/8856971521.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/zazomanuwofovewuxedum.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b96e1ddf23---67297033472.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73326104301.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3475be8d4---tuvupukasamotezagefu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/risisubekifobi.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/fd2qu4k50dgdda60b1ev55uj1p/lutimunusowolipa.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0b11a5b08c93f90d6b06f7fdef289386/wozivovapuzawopoxanomuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+de+espa%C3%B1ol+primer+grado+de+secundaria+2020+trillasPDF 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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 17964 bytes
SHA-256: 54430022372e6ea941c8ee7940112b5fbcf39f57325b1e50096ad59e5863e76c
font_01_sfnt_off00010c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1D 11504 bytes
SHA-256: 54be1ce349d82ab4dcb2d9f5e8154551f89f4a3f8d37ac4e2642e8c1e5783d79
font_02_sfnt_off000126b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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