Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a7aca819cff1de…

MALICIOUS

PDF

71.8 KB Created: 2021-10-01 02:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ac4a650ff6e445ee88c5353f36a8f58 SHA-1: f5faebcf541a23cae84730f0ffed1acc71fd09fb SHA-256: f9a7aca819cff1de9ea7c9afc4f1853e02c3ba2555cc59b299140440a8c281b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=android+emulator+not+starting+windows+10 PDF link annotation
    • https://slicktechproducts.com/newerac2c/userfiles/file/xileduwax.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/94357825381.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/69054493148.pdfIn PDF document text
    • http://wdnederland.nl/file/numarusuzisus.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/regazejetiwusurivemegute.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/cm1peg8qtv3b413tukgtvjhud2/66742940737.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/18600994561.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48191123557.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/puvimi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/polasegawatatijinid.pdfIn PDF document text
    • https://senfina.top/uploads/files/wunedumevapekofo.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/340231f54259d1b859deea7bd6bb8fd5/56254658808.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/domututoromosexi.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digelipuvuxudujisebidatab.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/97694352779.pdfIn PDF document text
    • https://penzion-palice.cz/content/lemulefi.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/minitovodugisenid.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/luvizakugafazemej.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/44922772812.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d51c83b81---xukadomabe.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/69779999255.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614064a0e5039---79336117770.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/98734568913.pdfIn PDF document text
    • http://feminella.ro/upload/fck/jolobolitusut.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/kerelasim.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_off0000b46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC82 10932 bytes
SHA-256: 5a589442fe42923749498668dd120f24077439276b195bf37998503373f82060
font_02_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 16172 bytes
SHA-256: 820eed751736b26f268f2e0a78efce5b3506877aff584c13f9b36252ce73b4b0

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