Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89a2cff1b946c01…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 02:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 048b98243e4f5f6a6c3af8b53cdbb176 SHA-1: ff8eadd1ca5a36dc3060bfab6fc92eff56ee2309 SHA-256: f89a2cff1b946c011dc676d022a3d151aa17c9078c8368846bb98ee2a1c2f4d4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple URLs hosted on compromised CMS upload directories, suggesting a phishing or credential harvesting attempt. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e3ecfd164174fd3eaf8a06879070de9b/62762631887.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3jc5m47pre0e3b2q7dur17guli/27658640749.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8gqc7gk81s7kmmqq14a36i6pir/30751778390.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wovujukunabeji.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/86038808653.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zosiwuw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608547f5ce277---82629768360.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/98765669330.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437c485f61---39990254521.pdfIn PDF document text
    • http://absigorta.com/E/file/53868156550.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/safuzasakev.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5a305fbaca562fb51495be43bcc91406/jonenuviwokoxoguwuxe.pdfIn PDF document text
    • http://salinahighschool1967.com/clients/c/c9/c9c88be04994199279bceb128c91314f/File/25566855932.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/11937184551.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/fuziredigobobejitijijuzum.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/52706635291.pdfIn PDF document text
    • http://isvpro.com/custom/files/54123508468.pdfIn PDF document text
    • http://arnold-sitter.com/CKEdit/upload/files/ritozasatemorimi.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/21a2f387b45d4797132cefdb7716d975/nixopijofi.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/98e91fd18089c7a4cbe144d0373cd131/69781597234.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/zogulobovipu.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/48303123436.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/45535796668.pdfIn PDF document text
    • http://hkwwta.org/userfiles/mulelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=html5+tutorial+for+beginners+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_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 18588 bytes
SHA-256: 26dfbc4a3d1a3cf46a0075833b4305e26d2f9d311b51f60bf6ab67a37147da57
font_01_sfnt_off0001327a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A91 11208 bytes
SHA-256: 7e26183f1f5db12706980075f2e33026052e6567000fcdc989caaaff8e0d59d5

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