Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cbac98833890d4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 13:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02f192d4dc7ef9a2a7be55bd520b9800 SHA-1: d212e0106d398f5ff1fdc6c61517fdfea4d7e62d SHA-256: b8cbac98833890d4093221c54b9473896cdb93da7cd6114e6aa924518fc7fa54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=download+komik+trigan+bahasa+indonesia+pdf PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/91974279f0ce521715d67ee16d9a88b6/lujexosegigexo.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/sasinika.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/tifoxuxolomuzudijiwoxu.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/44590766276.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/wuxawujivulazogakitiwi.pdfIn PDF document text
    • http://kisito.com/userfiles/file/36574085223.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dce430f5---gagitefanugonerubarikari.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcac66fae0---sesirexibuzomipimataxi.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/2mk8o1o5dsa97m3mgoo65jmenn/25508415000.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/84657267463.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i062egau628gvrnqpu3pgf7qb4/12416147655.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/magudofasusaluporonup.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/39571959578.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8de2f7822c9ada9a8b3840d539dcd776/65420076762.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/dibapiferuwanekosewuvam.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/76623725849.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da1a291a85---luburuzevimidevajodepuduv.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b16fec46d8---12609815619.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/libalomamugugiriwuni.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210707053829.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947753e8e5a---75171118463.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/89691860226.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c255d63a1---14801814507.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/92398892702.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/99854120433.pdfIn PDF document text
    • 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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 17660 bytes
SHA-256: 6250fe38730fe98da658baa189b4bd894969b48961850be05ad1648aa76d3b99
font_01_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 11264 bytes
SHA-256: 18cec71c3215ca4db19d0f64011da989a692643523f8a6c581b9d0d20f7aa504
font_02_sfnt_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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