Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cd6174b6340f84…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 00:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9fc384f3a640d7f4dd3312d49f598db1 SHA-1: 2e1f2083eff9020c34ab95e294ca9ef137f10e36 SHA-256: 85cd6174b6340f84c7af52ee3a26f719f94bbc31744fdc85b58bf0e882fe4638
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, likely to distribute malicious content or phish users. The presence of external URIs and compromised CMS uploads suggests a multi-stage attack where the PDF serves as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=homescapes+mod+apk+unlimited+stars+2021 PDF link annotation
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/44043995729.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/sezizaxavusukakazasuzidas.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/vipemusofulitipoge.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2dc9be141---26764290975.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/bixisibi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffdadd363---kiwovatibisoxisirejixoxap.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xovasadumazodutub.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/rexebomaveradigelo.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912114442523431.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/wemixabixetizaxew.pdfIn PDF document text
    • http://balone.net/_upload/file///40556633570.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/95252259576.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bee235671---kivokilopex.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/39883114815.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/zivozawedonibumina.pdfIn PDF document text
    • http://budka39.ru/files/puxerimujuxesopusuwawelu.pdfIn PDF document text
    • http://zjgjqmr.com/v15/Upload/file/202192552313082.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/mosofa.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/sedanaxojodegi.pdfIn PDF document text
    • http://vanlysecurity.vn/vanly/album/files/54014526727.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/fibemiwolikelakovugaladaw.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/35083125511.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/bedumuzalotez.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_off0000aea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA6 14672 bytes
SHA-256: 1355eba505a99fbaf40b620ed74cfd1a32b46dffa45a47b922eb430538aadf44
font_01_sfnt_off0000d3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 11152 bytes
SHA-256: 5d64d872ea300649fddba69ae53c60e9f6c0da3ec54ba173d3196a0b65871654
font_02_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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