Malicious PDF — malware analysis report

Static analysis result for SHA-256 33cd6632011d3207…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 09:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0e5ec60c13d69506189d51ad9e6831f5 SHA-1: a839ea14607b822b0f5ee4dd69a0837ddbfbc6c3 SHA-256: 33cd6632011d3207554451a35f6fdfbec9d4e022f61f844f963eb83931ecf19e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. The primary IOC is the URL used for a potential payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://smidgel.ru/uplcv?utm_term=how+to+break+android+password PDF link annotation
    • https://arch.ua/ckfinder/userfiles/files/volopo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/49625659309.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/tt7ud3jv8o51ila63gal2befs1/dufaluminoba.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/10824944565.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ffc94680250cf7e970fe0924f538e1e/21106050149.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/90225666084.pdfIn PDF document text
    • http://jadeite.ru/images/file/36775064177.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47120670396.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161316be8db652---78207626561.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/vujopazoposovuwumogaje.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/vaxeperilirisolez.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/pebax.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/jikutozikepepe.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/60522968499.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/popesozimonefaziwovak.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/gugefapofuliwetexogirage.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff52c56184---19720889174.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/bibodusupe.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/lopaxiwejutowulim.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/94787985476.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead585518d---povapamosilirunib.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/1912146911.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210912215630_1040286181.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_off0000cf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 10648 bytes
SHA-256: f61ef0432df63de587c6a05a5eaadb5831c062e6bdb76e89c448baffb644b292
font_02_sfnt_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 18936 bytes
SHA-256: a63fe48d96d29a7de17bf6d2a5ede50e5cf682a5e780ad6fae7ddfbf0a0fcf69

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