Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc496e815ea99b1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 13:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 53c5c4f4679729ca1476c289e5b5efa4 SHA-1: 95753b6f1aec30491e042320d5dc46e1a040a758 SHA-256: 1dc496e815ea99b15791d4c14a6bd8cedab6e12007edb3e270597448bf900110
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=gta+san+andreas+car+mods+pack+android PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2kp153du5ierc8gn8fc191cct8/52095913711.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/98446710114.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/dugixuwudamitezamakitas.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/94110155026.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b58ae2f28cd8827aa3f710b026cd1a7a/91789117798.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/vifemi.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/57657737083.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/fosigawi.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/visebatugegupojipanexiw.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161412c4207029---doxuvefozupo.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/30352302885.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/20091170681.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aa83122718ad36ec6188bba3ffa5e2ed/tupidapena.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/zikuto.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/posugeba.pdfIn PDF document text
    • http://wixoon.hu/upload/file/26800795761.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/66758740332.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/60130471057.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/janofokolinajeluwa.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/62881664166.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/61886840094.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_off0000d7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FF 10760 bytes
SHA-256: 96947f479c5fc1d4f7bd1c6f734102f35a5be8c6abd719af152f872b7094a7af
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 17664 bytes
SHA-256: fd4f161d4d2fee5417138d7727ef11049a46062415d078b35e1728e406fb562c
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1