Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ac075466770c2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 13:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db97e0923b05be5c5bef9b0bb96761a8 SHA-1: cd032f5c0f56603066d64657cb759a61403a2bb7 SHA-256: 136ac075466770c2b229bc75f2f416fff7c658a7fa7cc4bc773f52f222ac3136
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=chromebook+windows+app PDF link annotation
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/dubexafefabesisaverir.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/seranilaruxa.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/53169439122.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/71620781699.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/97927514393.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/6432462846141a5a372c19.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/fuzadav.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/42693467585.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/n5e4g28cp6q47ph59jnr1l608i/nezufomobet.pdfIn PDF document text
    • https://mmszke.hu/files/file/53492507760.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463eeea272---wutudovoradik.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/diwosoravopi.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/mimasegozowero.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/81312995716.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/63897850711.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b12788af---paneruga.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/rizujonifenuwasaxom.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/bogotibaliwudekoxigozater.pdfIn PDF document text
    • http://nemochem.cn/upload/files/98583941926.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/16988227694.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/pupozituviwideko.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/58771443097.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424fee07b61---funadumezirow.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 10860 bytes
SHA-256: 86aa6cb5e7d61e57ded8c10635fe98bc6cfaa0e3268a6bc692b741803c774b36
font_01_sfnt_off0000f31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31B 18208 bytes
SHA-256: 8207c48c860858314992cd6d1798e96dabc8319a5460c97b9747b04c41237f55
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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