Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a97f2b6575d8bb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 01:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27c27b41a2fe0de056ba408c4b827921 SHA-1: 71e45434dcbe8449c5c685221fe263cb911e4685 SHA-256: 73a97f2b6575d8bb95888f1661a1e3b4e973d92235f7eb08832c5300e819e17a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristics indicate an attempt to lead users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160783f98a58a6---99907628522.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/23955777092.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/pigelefoxejoletidofoxukaf.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/fexajizoxisesak.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/48195265869.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607f086239c79---wugizajodivurubuxokuneku.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c261da0528a---dosuzojofirokavaxetever.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d760cff36---87624086873.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/96580895038.pdfIn PDF document text
    • http://sentai.cc/data/file/20210830_181422_320.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5a7aa625dfb966c71528c404083178e4/ludowevijowaradute.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a953c19eef0---jawubogifijumo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/94086853063.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/rateku.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/33056563846.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/23934043889.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/mijutekuladuvamosilive.pdfIn PDF document text
    • http://funperm.ru/content/file/tamatovalusa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608089baafdc2---14276207102.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a4735673b---39170025483.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/565536508da07f1d9dea178cb2293869/bosavis.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/dozedude.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5nklfi67rc0h9vopvqhgtc3te3/buratibegonebetukimeze.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jc4nd09fk5sp121f88g5hil844/petomuraroretabuvu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/lphhk6js1mcq2tpqqn50uch5t0/17535041698.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f081c10e344---kigebowidajel.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/eeea60904e907eb8ed1abd0918205876/53020140740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cooktop+indu%C3%A7%C3%A3o+electrolux+manualPDF 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_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 11296 bytes
SHA-256: 3f93e67ec8d1b937ab8634c9738546b14d3f0c53018d71d8c2adb560967bada9
font_01_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 18528 bytes
SHA-256: 758d0230403f496232d23de2fcb8fb25273a2e7bebbbd9aa1efe5c6b1d0aba08
font_02_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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