Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1133dc4a137eb34…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 15:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7248b376540252faf0f4b4d1117ac4c SHA-1: d9dc58499e78a895af04d9961c4755f8c47fd0dc SHA-256: d1133dc4a137eb347e126ae397f43567c0d9e2db860d2e87920eed19a649a0c0
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 acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=tongits+go+mod+apk+2020 PDF link annotation
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/98ccde82fcec2eead89aed6c2aafc3ef/55772054155.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc07975a81---44650476094.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/88665999185.pdfIn PDF document text
    • http://kisito.com/userfiles/file/2941195447.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/dipukawagidefawuriwobetig.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/zezuxaburuxam.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/temibonogo.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/58236406118.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051322441296.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/34481077345.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/46354804785.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/10998589655.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/31954937818.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/73139622543.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/30524859093.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/mivajejilefozer.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/64677692044.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/omv7ou7kt4jejgqk6mlm5qh5j1/52748295623.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/87566911372.pdfIn PDF document text
    • http://gapp.fr/medias/files/talawar.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/86271161715.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9k16e70fua2evp15t66rrdu367/gisifevilegoxafopano.pdfIn PDF document text
    • http://shahgrp.com/uploads/9955398498.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/wanarinozizajavuwulazef.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/tiziwakomefudazudon.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_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 10756 bytes
SHA-256: 806d697c5ec8a358336ea2274abf0af02583f19bf127e789fac8389e98b3eaa2
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 17584 bytes
SHA-256: e2758124324fe4f8ebbfe752faf45770ff097dda65421043fc123b4bfdc02df5
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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