Malicious PDF — malware analysis report

Static analysis result for SHA-256 36424a3dfae76a9b…

MALICIOUS

PDF

71.1 KB Created: 2021-09-05 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4134753521db261647ebd3a773007085 SHA-1: 3b1c1783322ab044d9926df57cc6ac15a0a8c9a8 SHA-256: 36424a3dfae76a9b3cfc190679dda65a69255d554c540e83e0c5fe1611473bcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=5+pillars+of+islam+worksheet+pdf PDF link annotation
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bf543cb1f---kaxegubuwe.pdfIn PDF document text
    • http://live-net.it/file/mafedisira.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c1919eabd---bupoxitetok.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/37133678855.pdfIn PDF document text
    • https://norservis.com/files/files/padexuxamuwubeluperad.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/88588304733.pdfIn PDF document text
    • http://iwort.de/userfiles/file/dewape.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/50985182109.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pebetesasoni.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/jijebepujotepenabizeja.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jerarimimew.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/situmagabekef.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608217e852516---61094964631.pdfIn PDF document text
    • http://kco.su/userfiles/file/gejifenizoru.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f087671f81---palazilotajimure.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/63008496014.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d83c1e953---83627645877.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/77e6a7d87565e3b9692b80a31c2c93d7/62144087146.pdfIn PDF document text
    • https://digireg.dk/upload/24003221562.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e215f50097c---joxodiwasimuj.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/21096457644.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e05f33860e9662b51830a1b260dd8db8/67286661065.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/25336096550.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772836d0be7---96844864422.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_off0000b6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CF 10876 bytes
SHA-256: 7f9e89c8c2e70b1537447faab7dc1a7bbd3e4edfb25259723ed4795697db2141
font_01_sfnt_off0000cffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFA 15264 bytes
SHA-256: 7564ec3efd0cb9fc6add5a5c8959541fe3e4d2c9c6989ac57f5048b599e95eb8
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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