Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bffdca12225ece3…

MALICIOUS

PDF

86.3 KB Created: 2021-06-26 00:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3433d751c1d2bc6c466f3e4a38d1cbea SHA-1: 22094d870b552a7ed335085a9616ae694504252b SHA-256: 9bffdca12225ece352206372bd0123be18776e82a6ffc660cf14e0caebbc2cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://foodvellythailand.com/upload/files/sagafejibegixokubinatone.pdf In PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/rakoxagebiwewolurofezuxuf.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/jolejofi.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/nujavunemepofitidopi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ac20a32adb06635d37abf91c98a6ecf9/rasazulisidabi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/sklv25dmr5vm0co48isah3ii2r/pujur.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4048acc0---13145746693.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae293ffc8---42643866568.pdfIn PDF document text
    • http://alkanboya.com/files/file///dotebiwerojologeja.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/92928016587.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ribedatemulujojil.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bfd06a4e7---45496541639.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4271f2ed20369efbea6f3b4470aa763b/bajalutow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29bf5b745---gozulobu.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210618005525_6idvxb.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/xorimolututuferisek.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/43054364916.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/53569665372.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pofubune.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/14c61d3d7fb29b6b2bc50da2c0c77f24/senabarafusofisakogirerem.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/665c52bc0d9a2daf85acfc79456a4fd9/tubonetubawaxe.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fa7b5d434bab7aef9a5a6c496a9dd89b/kawewoluzaxafin.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/46lpjlc9bcffnid7t9a10aprmq/junovazagemiraxexopej.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/34345373542.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/batukemopomuzebolulaw.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecec38cf54---57945874147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=example+of+project+work+planPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ef895ff5009faf62e21cdf625da94f83/97760361008.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10776 bytes
SHA-256: 2d3ae4d9829494d6d7d9131f74cf7b946fa33c41198bbf5d105fa1c7d1823f1e
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 16280 bytes
SHA-256: 024a5854e43438b0f5a3f94aa063c64a00192d8a60472411666883afb742a52d