Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d02b1b4976710f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 03:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b40f1985319f7975418f0fd87187065b SHA-1: db05d268e37b48ded19f7dc4c3c3a0b23e3217c2 SHA-256: b5d02b1b4976710f2626a589bc2f379d0ee1aa37c39a0f8952ffecd17f47b35c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and links to compromised CMS upload storage. The document body is heavily obfuscated, but the presence of JavaScript and numerous links to potentially compromised websites suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b56897e8a69224befd0e91fc803aed04/mosuvujezokav.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d380aa1ac7af0e1e2099c038cc35eff9/sumulujekoxulovujaw.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/14039369057.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/pelirudaboxaju.pdfIn PDF document text
    • http://ubest.ru/images/file/21569551387.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/tufuvedu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f663e0ede3e---56646817013.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808372c45d2---vipeweteb.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/23772968620.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/32441717133.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/88216234616.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/85150666932.pdfIn PDF document text
    • https://people11people.gr/uploads/File/gikiwidekuv.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eb119981c038b2bd72bf2e464eb397fc/zilizurokoni.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/q4qfu8tpqlsgic6pftftp8v197/runugufoxabufutikuli.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/55043133049.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/mk9un3ehikkmj2ga8a8ku0hlm2/guvujananukozukifowiti.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/7n78svnpopef80nr0h6jaquqk5/66121544653.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/43684363373.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ffc0a9df---maramefapogodazunozawumi.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/nobopofekidufebimivuvem.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vipebago.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/19969893230.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/a7bf25a072aa863e73c6bf0121b1cf38/mufudavokugoseloxuligeger.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/befiwafiteluzadoliruwodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mool+vidhi+book+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCB 19608 bytes
SHA-256: 203be121f664e65e155a5d37952e8d5721defa0aa86ca85892051ab11867bc9a
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10476 bytes
SHA-256: a141e755e6e5eaaa76e76b524adcdfe1b657d1dfb5c006116d663b0be039c984
font_02_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973
font_03_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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