Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d81d8068b9d0157…

MALICIOUS

PDF

79.3 KB Created: 2021-09-12 21:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afc9eacd517fa80bb59a6016352f37fb SHA-1: 84f546bfd8e2e645ae58f808390c0d4293f07c2c SHA-256: 3d81d8068b9d0157461eb4b9abc774788ee181abf7de2276071ec03806786de9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. Heuristic firings like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely intended to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=circus+words+that+start+with+p PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613269d55d63e---24866414858.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/91146433985.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/rifas.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/ziwux.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/60812196141.pdfIn PDF document text
    • https://izr.fr/files/63135817311.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/sogenewiga.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/70476690751.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/8937368188.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/jijuvudojosovifulivuz.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wupazorufewusabije.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vofif.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/kusupibexaxazovejili.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b4e94cc94c1bdac3bdb7ae4db5af2309/xibenutiwus.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210912123528.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/nenepasa.pdfIn PDF document text
    • http://trevorhannant.com/gigolozupotifoj.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/h60rahpfeg3lm4gpk44i6of80q/64733477959.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131643bac07b---xepafixorusotifanajuj.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/99500657781.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/79725980812.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/bozabetu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/454b32c39c1d2f5553e4f7375252779b/4219485067.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/51741198353.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_off0000d02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02C 18324 bytes
SHA-256: c06fc1797b4770ff38f96eb618c12efa9ad9eb3086bd6ab2d618add8b602aa6e
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CB 10544 bytes
SHA-256: 48b454eab4f3279999bbd62dd7be223e919db3a309f8eeff6248de85511b51bc

Open this report in the interactive analyzer, or submit your own file for analysis.