Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7f679bdf751628…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 13:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c246d2ff5c3f41d91794d5ee79e4263 SHA-1: 3a0983e2618d8270388666f929f6d37bf084027e SHA-256: dc7f679bdf7516287dc9091b8462baa8ca59fa2c75cb7cabd8d4f16e2848c542
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, some pointing to compromised WordPress uploads, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates a potential payment scam pretext. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://citytrafik.nu/images/file/zajirirogeku.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f333a9ea---fipituvofizi.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/vebosor.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/zuripoparexepesesuwigi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d67923d5b6---19012261553.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/bivadu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/sitaxixerozubikozuxedexi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/294d43867c416d3209ca56f021777d26/kiduzujutofezuvibovebar.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082432a2157e---591375632.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/zixerokijapobemezixodive.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/tobobitirukudawimeboji.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210521064359916.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/17426532309.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47c5033f6---xefavuni.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/11197934019.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16094d79e03364---2856146730.pdfIn PDF document text
    • http://emannsltd.com/userfiles/80902248164.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8b24740bdf6856293ce0f73b02f8f7f1/sibibutejuvotojigupun.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/dusekewuvabi.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/76043207199.pdfIn PDF document text
    • https://majubesar.com/contents/files/47228562262.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/14039973273.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ae90846e---24004929735.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/27079698561.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6595ec8a92---vomejudobek.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/wokol.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/powipawuriperuzokazoxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=array+and+pointer+in+c%2B%2B+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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 16792 bytes
SHA-256: 82e392eda5f883b1e3bb27afb78d2c273fc1d4b1b0ade5d8b018872dee17bd56
font_01_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10492 bytes
SHA-256: e3550dbd03e59b6cf2eaeb0241bc70a50740be06eb616a82574e392bd5d72c16

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