Malicious PDF — malware analysis report

Static analysis result for SHA-256 64df74f1d46b09de…

MALICIOUS

PDF

72.9 KB Created: 2021-09-01 20:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b6beb97d211fe66434b270f42b882dd SHA-1: 7a60c485bddb13ef2ca3a5f12fdb762459f11b89 SHA-256: 64df74f1d46b09de27d4cc2b9848305237f2b0673d3c55b8e2a6b96d8d39b83e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/e029a2f08def0844b207ff914611eec2/79840915777.pdf In PDF document text
    • http://obasekiestates.com/UserFiles/file/keluvegureparemepomuviwan.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vafibisa.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78145912989.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/72325606275.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7a79e9e8---goxolijotulejerugulamuxa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607df49681c9d---35293144758.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/317665080.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ivslqjcskofuonfaitnv00b3f7/rinanerorabadigaxipetigim.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c3321528---rekuguzo.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/48863866087.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e2lnmpn1qe41ajf9v7o5aek6k6/fekurom.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/77029491952.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/89788109351.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/e9d855446bc36ddebe5d14f4dee77e07/bigopisalomik.pdfIn PDF document text
    • https://path.mn/userfiles/files/lowevedegexalani.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/gilufo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5eecd02202---59810913501.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608601e17065b---judesupawusuneresaderales.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/5378646807.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/pevazaneveruvakixupoleset.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/7r9lt57egnfqaqnnpshp50i596/faborajapudafexop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=telecommunication+exam+questions+and+answersPDF 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_off0000b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 10928 bytes
SHA-256: 682515c8b559f79b99fca6c1bb3b90a82097579a7c8e365608dc347245a85513
font_01_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16084 bytes
SHA-256: 0ca973b0d2d8c5e34383c5ea6ee806de7dea6d050562b1f0dbf4f4db61080139
font_02_sfnt_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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