Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3feabf2b94bb945…

MALICIOUS

PDF

70.0 KB Created: 2021-09-11 23:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dedb7780e2ff2ea4a7e34067bce6b542 SHA-1: 79b8922811517d2908cb8b9cd0c2d2dededff7f2 SHA-256: a3feabf2b94bb94585cfcbcea1b404d4cf4ab22f4aa484eacea7ab63c734e373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and EMBEDDED_URL heuristics further supports the attack pattern of luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=effective+trading+in+financial+markets+using+technical+analysis+book+pdf PDF link annotation
    • http://ufnk.fr/app/webroot/files/file/61507326853.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/62350473031.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/32830458502.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/73521323271.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/lazajixamedibokor.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/60391216262.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54dc2f13f---karolitorulutibagel.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/vefovewemosobosog.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/tawugiki.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/56917165008.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210901_67DFB9AAA6FCA453.pdfIn PDF document text
    • https://t2sc.me/userfiles/dibisanabebuxufimir.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/39551711106.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/daruxupab.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/8015840275.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135a32904cfe---55866057914.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-10-08-47-25-98.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b517d34aa---66392064288.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea9ef79bf9---61290643023.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/6e3978d1cdcb85bbac41537207e3505f/netesobalizama.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f004915737---25237248548.pdfIn PDF document text
    • http://etkenkalip.com/files/wojimerafixajijego.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/88203168549.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/58441781100.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/senivisoxawerufusezo.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_off0000b3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B2 14272 bytes
SHA-256: b2a8e1d2b07768c719bde5c8b32daf1b400f110cd2aace05a68ac2f6f9f87fde
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 11564 bytes
SHA-256: 9b4715e53c143e108b6dd052d1ace59b147fb1831ed6610b6eff9266a2e99966

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