Malicious PDF — malware analysis report

Static analysis result for SHA-256 881446f28c7f43a9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 20:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 702c2189d5792f557790d7ea221791bf SHA-1: 979ffa606247633946888ed624c9def38d043ac3 SHA-256: 881446f28c7f43a977c5ff29961ec37780356de19d138c907a457c087f7cee16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qqvp8hem1q0nqhj5dmiftt1m2c/tutana.pdf In PDF document text
    • https://nsaimmigration.com/userfiles/file/87043467164.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becde6c00d5---bezuben.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/99285947861.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/sulawigenovozezafu.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/35782401706.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/20871559717.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/78054616834.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/rokevejabukogolemus.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/49342691907.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/52486997804.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/mivad.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ebd5f4b08b2c1b1de88f2e71e40207d3/budilenap.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/wivepafebixubepewa.pdfIn PDF document text
    • http://trivio.it/userfiles/files/90922364199.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fntedqv58cg9egk8tu8f66quoh/gifixonekibigoriwol.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161093086d3485---komajes.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/94617377201.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/zosab.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/zanudem.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9e36b155---55963429231.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/muzijujum.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/vvfchcj32t854t6c16frjquiq2/wiwinigokimojisozefuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=irregular+verbs+past+participle+test+pdfPDF 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_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 18936 bytes
SHA-256: d9525ef70c55c30a260f50ba68e5ebfce4d47b7009a7ad6e9919f2364d6a562f
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 10828 bytes
SHA-256: ecbde7da613027e459826e8f29a7a39d371fc8c0d3fa488599958634613673a5
font_02_sfnt_off00011268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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