Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d2365b33009f6a…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 00:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bfc89ea23424704e0441373824aea4c5 SHA-1: bb6635f34775126b0f56ead4e1644bf7c62f624b SHA-256: 29d2365b33009f6a03768435071b67fc294f8de0a8858df062c799943d1826f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely used for phishing or distributing further malware. No scripts were extracted, but the heuristic findings and URL patterns are sufficient to assess its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://laborke.ru/uplcv?utm_term=beck+depression+scale+pdf PDF link annotation
    • https://aykutemlak.com/upload/ckfinder/files/13188871208.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e750b65212bc91afd3780b71731aaebe/mefovukekun.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/28145494423.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dda7a704ca5634b6e4f4e301edb3288d/votesoxen.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-18/20210618094324147497.pdfIn PDF document text
    • http://burnettefamilyreunion2021.com/clients/867108/File/42436438203.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/merupagerenorisutepupav.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/22se1gs5d38qm9ci63i6ghpobj/7268978901.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161004318c4d0e---72078317771.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/paroxusidopu.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/61666720059.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612169694a5cd---liwezajufusikegepimadarad.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/29764082395.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6b94821d---66388571592.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/81daa2aa831e7857bc5cd4b87e39c95c/55859798931.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73f768173---51900728096.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/fawidapamuragesofobo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160962206ac169---sidibibudag.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jikefiputaf.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98659538687.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/topapezukajubuvuze.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/99603678295.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1ctakm7opudfocse4o5tvlkvgg/sogoli.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_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10660 bytes
SHA-256: 426d024be75c87718509906529a77b038727fd87a8c5b1f064b8cc1a4be90b56
font_01_sfnt_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 19296 bytes
SHA-256: af12faa8a39e399d1b2ae5ff29e029e6a16a6ed116a6afde306db77e967d7af6
font_02_sfnt_off00015334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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