Malicious PDF — malware analysis report

Static analysis result for SHA-256 76df61e893ad5c72…

MALICIOUS

PDF

80.8 KB Created: 2021-09-01 04:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc2a58c88321e9cb5627d4dee6a09714 SHA-1: 3139489980e02d1f7cb202aa6b6ca85dd9b2d73c SHA-256: 76df61e893ad5c726d34d8d574d00dc1754c8d2339c9a039120fcad1fc2d13d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be hosted on compromised Content Management System (CMS) upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=brown+yellow+color+palette PDF link annotation
    • http://ankamet.com/userfiles/file/49647848132.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/22713071326.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/57514967378.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/15dd6eb278891e0cce678ad9b6182d1f/tuwoxovavowaposi.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/78676524795.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210808_3AA185E1EA2696E2.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210723174438.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/digumivokedesijowumupure.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///lasitidefadusifev.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/58ffa3d4559c265fa9dc9e0dce9c9d13/luzojivuzi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c564ce6cc859311b6ccf54e9d5075b74/lijeki.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105190419185875.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89167729602.pdfIn PDF document text
    • http://garderoba.sk/images/_file/pagamuxadegadikajuni.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/sibujoxa.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5336a803c94f9c9388a3292be192bf88/fatirovabejedejagiz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/udhr95cdm10mncgo8nu25g30d7/18626792042.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/93bdfe0c632265cce20dc48600361aca/natuvokakadaj.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/tojob.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160fdebc4dbda9---831143352.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/61i8bu8p8og7qcddfh8jito1c9/47032847422.pdfIn PDF document text
    • http://12shio5.com/contents//files/73340172711.pdfIn PDF document text
    • https://agros.net/uploads/file/ramakuw.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/390b7e2364560011ec0a60d605199e50/mipuviziv.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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10360 bytes
SHA-256: 27143c94e135df5d52808953b1e50889e3317dec833dbe7fa43c0993c3aa47e0
font_01_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 17344 bytes
SHA-256: e0b2d8e60dbf647301132117e5b93692355f204bf4e2237671de0e7e99463951
font_02_sfnt_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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