Malicious PDF — malware analysis report

Static analysis result for SHA-256 507b557bf99d5f5d…

MALICIOUS

PDF

95.1 KB Created: 2021-06-29 22:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b38baa1b966f2a49981ee7321ed745 SHA-1: d97570bd85ace3bd7348366a53f47bee07ca1d02 SHA-256: 507b557bf99d5f5d3e1ae4d9166aa109c390a95df393f8981c510b67da4bffea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users to potentially harmful sites. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2e6a745---ganegiraral.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/daxajixoku.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vexizaxotezajibat.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b43297b36faafaaf08b95d80ef76585d/70623125324.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210517125203.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927cfb2e49c---sifosam.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/befusozufovaxigixanewenox.pdfIn PDF document text
    • http://hydrem.ru/images/file/26484558696.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/finubuxapumixobekelewujox.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c1597854b---tozogigazagobasazede.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jixakejerebaturibokajekas.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f9d6c8ac4---vitineguximavanorokene.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/79935622437.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9492331e8f4bd0aa312aa8efb97f5cdd/35007335040.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080d62f12015---nepuzuzazisowerovuro.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/zorusapiv.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ebb95b5bbd104e7f571b3c28ab4f4c79/kusupagiwipolanakere.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/31cc2d3f768c130fe9b9835a8eb4effe/96725777369.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/dawugikaralumo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/0idi37fvq1fh2g0p45co7af4bn/wekezalegimuboxirakefi.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/8797692194.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/9ed26942d2a97071ce0c4dbcd250370a/duzisefodekes.pdfIn PDF document text
    • https://people11people.gr/uploads/File/96149971846.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/su22c96k0a679deq61ihm6kad7/76953796398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=political+science+class+11+chapter+4+question+answerPDF 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_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 10936 bytes
SHA-256: 4166bdc835cac9c67e0734f98ec16bf5d4a6f9bb0b1ebc1544a764c762647310
font_01_sfnt_off00012881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 17120 bytes
SHA-256: aaf53e6e196d8f150c65ab9750f94673d2ba9295aeafac1b844f0da2b137fa66
font_02_sfnt_off000154c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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