Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf50aa023e215cd8…

MALICIOUS

PDF

96.3 KB Created: 2021-07-05 17:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9f981e4da9a329dfe9a083dc450b6157 SHA-1: 262b6f77d58a8b915cc4a9a5cb4e1aa3aec2213d SHA-256: bf50aa023e215cd8597afda2fcdd175464c30a898ff329182d81fcd85aa06f63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate it's likely a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://daaeportrett.no/upload/file/libozuxakanuwujud.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/548dd822amserdsqqra0iohtmn/49289685601.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/959v3ds140ei2e9kj9gvkc1slr/xokiwuminus.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/52903781148.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/65094819460.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1548320d37c7fedeaad2051ec038549/xezisogutazol.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/93qej5effmd234j660t25jgm04/xozosonapefupevosilu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/14681486348.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/rixoginapogovi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n34i8d08jan7ifsiq0ko4cpfm8/jalaxerevuwevoxipipov.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/4508671839.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/topukanuwuvuwev.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/81771533952.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709b52efa43---32441833596.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/tulunalof.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/liretosigudi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/970e6a32a867052de1c31b2b71a35670/nirabusanubifatuvib.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nawupaxafa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978998841b3---rumifa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/nudikud.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb08e9f46c---1350805122.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/iarv0k05if07t325sf71jhk8c0/76706515016.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cae92edb213---vaxorunekijolafawilevep.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624551741.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/pupipab.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/52921461385.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/pewizogifaruzokavujibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=all+your+mightPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC6 2276 bytes
SHA-256: 1d365568ece1bf60ba60fb6382ce6fd4528684902625b3a38edd17257e0a98a0
font_02_sfnt_off000118c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C2 10184 bytes
SHA-256: 3c7c53d4d62051055456ddfaaa2182d5681c6fdc63dff499cddbbc99dd5637d4
font_03_sfnt_off00012f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F88 17500 bytes
SHA-256: 2d2a6fe84af4383aae2cbfe0503938b789d1da35fa37db2d5655686fa7b2ca63
font_04_sfnt_off00015d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5A 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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