Malicious PDF — malware analysis report

Static analysis result for SHA-256 1274f970aabf24e0…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 02:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46bd4a39b4b077f519c56185e0c23afb SHA-1: 48ef18593bf692e58981fd1738dccf849b6cd73d SHA-256: 1274f970aabf24e0bf49d89ee34dd7b48ec7f3fdf02f3e945e26a1fba84de1c2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pelicanfinancialnetwork.net/ckfinder/userfiles/files/46619734149.pdf In PDF document text
    • http://18554080.com/userfiles/file/bogojapexipepas.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/76029738705.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645450850691826941.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/45auhpjct7t3pet0nmekgtrcnm/kuzedejagopavanatafezo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/efee969cadcdfe26205ffa7dc413e76b/dawepuripalasava.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/2242281427.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dfp3aqtqpp81iompcuedvp8p04/91160433231.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gsmrc1ie2i4il59vvuluu7mcli/kasoxawuxebo.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/mutudixisowerezod.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/degoahkekeci67av3m46rli2f5/nogisugodok.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/db0e37af1d64693d6db53277fb3216eb/gifiripososa.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/mofodemepejano.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/60896471399.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d286bca8---guzifedoxipibesepaxavuwi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d5db12a9e---52836569339.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/11709994176.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210628160956801.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/paes1t3c3m35499tttes67kj0l/92966858074.pdfIn PDF document text
    • https://moolans.com/uploads/files/34852621908.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea0597a87---97016647428.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/47513900088.pdfIn PDF document text
    • https://unosms.us/userfiles/file/18924299840.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825bc19c5c6---58211831238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+river+for+fishing+near+mePDF link annotation
    • 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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10199 16580 bytes
SHA-256: 32640fe756ca0fcfd9e0ddf7de44d1d2cd4ae3fe87742a7ed40c83f6b4212d8e
font_02_sfnt_off00012ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA9 10736 bytes
SHA-256: df2b7fe580d76571800f7485db37889aaf789c8bc24356fda39b544507e0547d