Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2e1aa36bda9462…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 04:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65b5a80c336c6b7c76409838ae475f99 SHA-1: f573205038c47440ab744b46a7a658e26e799d4e SHA-256: 4e2e1aa36bda9462a0f5a002cec4c759d510b4441b8f8c3bdbefc3c53559ba4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs, many pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or SEO-based malicious campaign.

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://huntic.ru/uplcv?utm_term=keyword+map+tool PDF link annotation
    • https://takarasushimn.com/userfiles/files/gewebulutakulokukiragefa.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/vugesabuvujeme.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/90760243496.pdfIn PDF document text
    • http://saaretravel.ee/images/file/50078850903.pdfIn PDF document text
    • https://superpart.com/files/felenedisuzesasuzax.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/85384813281.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/22298021005.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/46067534642.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16983421196.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gosudojoderozajas.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3500347348.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/roxul.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/39lr7nobpr0e36tcn6s0lfprr4/31335773699.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161325c32763fe---10712739679.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109082210491095.pdfIn PDF document text
    • https://produse-zilan.ro/files/29925861862.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/nemurixoxigi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d5a40f4eefc669121bf812d9e601ab4b/kixadexusifonoxotufunuz.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/pesavemirudotupapazolu.pdfIn PDF document text
    • https://digireg.at/upload/wulakidibedajefarasafit.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/dodezozepizenofegi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161395f7fbbfe1---23265856278.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/10610957127.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/tajozosegewesanunumikasax.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lemudidabawa.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_off0000df3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3F 17076 bytes
SHA-256: 4467e92030dd9ba89348f74127a1158037ab9450abdc36daab1cac7427de4213
font_01_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 10380 bytes
SHA-256: e494b4d2273a45aff1f23db684fa287aaa1f119f7ea3cbede3580646939725b3
font_02_sfnt_off000122f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.