Malicious PDF — malware analysis report

Static analysis result for SHA-256 0090256f8c2008fc…

MALICIOUS

PDF

110.5 KB Created: 2021-09-06 10:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ab7853df5d87e98f2442667d0e8a2e7f SHA-1: fb7e97c999128f35fed05c6fda52a8060300a2c9 SHA-256: 0090256f8c2008fc8eda2619a19e7ba2aed42650723a825b6725b8351703e0ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=raja+yoga+astrology+pdf PDF link annotation
    • https://cncunse.com/d/files/56997248150.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081e614e1e34---4831195819.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd47b0de5a---nubabo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ff0bcb1e---fetudu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824f0e9b4a8---lepon.pdfIn PDF document text
    • https://baptistfriends.org/media/nodanilaretipaza.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609965fc87493---gunawojaxugil.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16252117716546.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/babapubazoxizebirebo.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/xusuk.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zanowekenajerowutepalaze.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/78991396924.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gokujirurekusamapewi.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/sujogezeweter.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/vnlsu0jn27gvdkcfeedbv7h3mj/7225194350.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/fixutataborozowazejububud.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/22285449363.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/19r46ng9s2khdq00b6afbvee1i/85043535977.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/6949489732.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae589eaa380---dulokemo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/7922116224.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/korebenegekom.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_off000147c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FE0 10632 bytes
SHA-256: 38aad9f59520d3104fce196a548b203ed4531c4f76cae97d20166c4e43f8b397
font_02_sfnt_off00017830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17830 20132 bytes
SHA-256: 4d6c9151a4727cd55a8217506a09ec63b8e5b429e1e470c601e1b046c21b286c