Malicious PDF — malware analysis report

Static analysis result for SHA-256 5427179e35d43985…

MALICIOUS

PDF

94.8 KB Created: 2021-06-26 20:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c800b08316dad2fa6cbd081d7dcc984c SHA-1: 4290f5333cd07148528f649cf112ad766c4dbc1a SHA-256: 5427179e35d43985d981c988a57ae2cf15c0716695e4504dcea1e9f94f745386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://drafthe.ru/uplcv?utm_term=mr+interview+question+and+answer
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/c9327f51abe26c703d6d4cbb746ddb1a/37872361960.pdf
    • https://planet-for-events.de/userfiles/file/walusazidagilof.pdf
    • http://czytamzezrozumieniem.pl/userfiles/file/9428171020.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6812799e8---ladirovemedixepifukinoxe.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075da6a42e59---29591686741.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/49110278056.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d3c3c64bd419423d925373a8ec1d3e93/29149336016.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/12dba17b162efd5b01102591edb00dd1/94184320975.pdf
    • http://df-foundry.net/d/files/rolikaxulinulewen.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607417ab5c04a---86452863652.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608803fa8a7d6---3562149582.pdf
    • https://luminex.pl/upload/file/rijipizukadijemebob.pdf
    • https://p1gtac.com/uploader/files/xirawotimoku.pdf
    • http://studiodabo.eu/userfiles/files/4732683179.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/173fddcdc5d0f64ef81b92471807ae95/kipoxawobaf.pdf
    • http://medi-sen.com/files/files/govodogogutijewiwi.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c0565a952---24225192478.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830c819c7e3---likapofisi.pdf
    • http://moestuinwebshop.nl/userfiles/file/mupedizolem.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7902419e---jemukolojoweb.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/gagos.pdf
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/14233897865.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7ede20a3---56657534359.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ffa3a81b8---xatufuxamugetagofunivu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e7f.bin
780c98fc61b0c448573866dc86d400f311a672ce5d9fdee1128982380cb02217
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7F 10588 bytes
font_01_sfnt_off000126ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126AE 16792 bytes
font_02_sfnt_off00013ec0.bin
b19cd7328f18679c74399228f8638074ed12266e3130bf183439aba85cdcedee
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC0 18040 bytes