Malicious PDF — malware analysis report

Static analysis result for SHA-256 3997aaf8f7245943…

MALICIOUS

PDF

111.9 KB Created: 2021-09-04 12:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 56bf90e4a8e27ef4a22e53be22fa74ed SHA-1: d25bbde66b53ff53afd853872bd344be25349a9c SHA-256: 3997aaf8f724594301e2bfda9ee22a986cdf3cca06005bed56c79dc2aace69b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the heuristic firings point to a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://philabc.ru/uplcv?utm_term=manual+cnc+milling+machine+for+sale PDF link annotation
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vrpfigba3gfho14qvlufldhcj1/gedeko.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f09480d3f---92700577716.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/25560006143.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ch88eb4iejo358ngghuvcdbj36/jipuxexaruferigokexe.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/setanegilusekasanafi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef38b77088---27947105811.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210820_2F242937929B8D47.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/88718335978.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/fexejukinejojake.pdfIn PDF document text
    • http://otartufo.com/ckfinder/tartufofiles/files/83663367758.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/50997101681.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4f573e5ba230ef77ea6b49fd9112a5ff/wugogokenu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c0304d911f0---98263110623.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e2f72ed8d---2216668505.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gifavewimumugufesedoka.pdfIn PDF document text
    • https://patc.fr/imagesfile/kugatarujesa.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16072c25a3b47e---valodinutunopa.pdfIn PDF document text
    • https://reinigungsfee007.de/wp-content/plugins/super-forms/uploads/php/files/lak88vmevalrhorh8v981mpkqm/lijukubapakepodofimez.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/gudepi.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c5aa976d---lolugotokabiputedejafe.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609288eb9f906---55109503073.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/kion8d66urm4h8i41kf1ipjk3f/jinabonuziligofu.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/57361941274.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be085db8d44---70838054312.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161111a3081ee0---46932249821.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210618042705_m694l0.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_off000153b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BCB 10776 bytes
SHA-256: 3f45bf041a1751c4adc616e65c25fdf066025aaa1ad028b107710b0b1d9fdb56
font_02_sfnt_off0001845b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845B 17296 bytes
SHA-256: f3553f526c2b143224553febe77e4bcbea5bf39ee6e8a5914a3baf63233779be

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