Malicious PDF — malware analysis report

Static analysis result for SHA-256 637999cca942d2c4…

MALICIOUS

PDF

81.9 KB Created: 2021-08-23 20:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2c65e555e34efa6e7875081e06bf893 SHA-1: 795f84c6c3865babf8ec5e3226fac7cc9db8b57f SHA-256: 637999cca942d2c42656d2e5075ecacdcbe99d7c662ad9af6205df614bb03d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage. The presence of a 'fake delivery companies' UTM term in one of the URLs suggests a social engineering lure to trick users into visiting potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/8d7e25d3bef30d66209a9664295c3efb/jujozejadenibiwofoso.pdf In PDF document text
    • http://thesprotia.gr/uploads/file/mapuridoboz.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/16154275610.pdfIn PDF document text
    • http://nensi.si/upload/file/91217177969.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/lokaxamixofudiba.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/xalajukekugelonuzab.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/86372243561.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/sejoxavuximomo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/60k3ch72t5p1376tkchnnai9f7/tajoger.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/48378834538.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/gesasejiwifemixab.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5a3c6584a1af9c959419923aeaab6f3a/68095839565.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846e137824f---fekowu.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/43c4b676916ded7224e726b58a182ac7/dovaja.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/2108984054.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609659a86d0b4---63551360952.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986446ba8f---kasupuramizibib.pdfIn PDF document text
    • http://fygl.net/uploads/file/020010455506.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/luxozawo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210703000657.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/sofupadalud.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/60c4tn8tditmr4oq8k8jm9ivfd/47134573981.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160af97384c7b9---lenosa.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/rukagagula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fake+delivery+companiesPDF 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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 10828 bytes
SHA-256: c5a2f9dac712bc1fbb7db05c7942e1c4d8c9058bb90a08fff54febb997a99e45
font_01_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 16920 bytes
SHA-256: 80a315e9500f4147503d34a76ee1adb9b57bc76d758da3d36a83f4b5ff1c5894

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