Malicious PDF — malware analysis report

Static analysis result for SHA-256 f521f94d85b0f307…

MALICIOUS

PDF

100.8 KB Created: 2021-09-05 12:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df50b0501477c4298c0262969e15cd53 SHA-1: 95d30759a5780a70f8c8fffbb9c47ad03866e1ca SHA-256: f521f94d85b0f3071f9c7c51b832a6b6d2744a4c9fab77420f6aa0548fc80d95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c876605f11b---41096982463.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f3e0ccf4b---muvezodezunijagufake.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/xebuloxonogewo.pdfIn PDF document text
    • https://bliznacite.com/files/konisel.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/97899203340.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/kosezozurevukeg.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/81502870423.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/jojidadobikeriretotilu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aedebef7a---7134975938.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088c36c694da---52692976421.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bee11c183---poligamow.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/zunezinenowexepadetubu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773138c0850---posusagepev.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0630db577d58d7f58efadced330a8222/76928101574.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/79eb170e47bd2759de77a7bc43da434b/51534185842.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2e49ush87skrdhfo4r727315h8/46964409958.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/9h1ed668ng3t86pkfvttnm8lvc/vabogope.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/79967080551.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d8a3041ac70910d3aa864235d0fa90d2/24620323939.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607404a09e85c---gibejub.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/22280772127.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b8143062e---37322766241.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/pifurifovetokaregew.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vvb72vkva3n709nhtk9407esl7/porotagabi.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/tobivakezoliza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=philosophy+of+economics+books+pdfPDF 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_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 19324 bytes
SHA-256: f7de56f16e5c83bced7d9778958bc8ad2959419ab11309f010459e89b28628a9
font_01_sfnt_off00015442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C59 10872 bytes
SHA-256: 301259b7bedcac97edc1c0d96c1b509549708cdc6b74c5da378112cdfafd0eaf

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