Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1bf34c9ad1d162…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 09:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50393533495cfd887bb9ebbdfd103155 SHA-1: c1b3503571a0cc3d3d3e7c150de82c3c84be75f7 SHA-256: 9c1bf34c9ad1d1620de54680ebcd68f7c58ec42d68b37ce6fbeb1c9488980496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or spam campaign. ClamAV and ML classifiers strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=watch+the+blind+side+123movies PDF link annotation
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/sajegorufenopejusedumoxid.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/xelagi.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/mulalutafazodozamasa.pdfIn PDF document text
    • http://bulmarconsult.com/files/xopugusagi.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/fonozivejigex.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/61397210869.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/33369657426.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/62f1919dd08cc9673eed525ab58b4e8e/57777024431.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/33759947017.pdfIn PDF document text
    • https://badoza.net/userfiles/file/65702179097.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/68618661891.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/25435641843.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/takitakifufupoxawavatako.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/21387559766.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/senalalajunupisavalixun.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c64b5b5a---zomabevufofen.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/zadiwuxariluxekofexavix.pdfIn PDF document text
    • https://sainaudit.mn/File/diselokesixuf.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/60341242742.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/kogazikadudewetifiri.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/leregisipevin.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/bupizivip.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613939187de89---rogepo.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/boparewo.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/96401118471.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_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 11080 bytes
SHA-256: 73b2c9155cadb5a9bf4aaca9d3442af69d6ecc9faee06dd2fc68b64afe641aa4
font_02_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 18628 bytes
SHA-256: 5a7daefef59800c656bf0b5747608389fe2ebba532e118d1f87fdddaad17c5bf

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