Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b095282b68e7c2…

MALICIOUS

PDF

77.7 KB Created: 2021-06-28 19:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bf7cfc353c2301295b1897f51e78d1ce SHA-1: 28b63926354e8de4065c81a70f1491cc2400cad9 SHA-256: 84b095282b68e7c207888a5c06191b57fc2deb584e195f44d9ee351ba8e2f3df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://shuswapladystriders.ca/userfiles/file/67550555599.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cccf8378163ff030e2f0efc0be0cf013/62729366880.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f25d468490---xinefoxi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091c369e6735---34580237313.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ca896e6c2---judinetimarepexuduru.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/sogidagajifutuxirekan.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6e55370---wozazerizupexejugir.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a4eae1077---zujimidafigufavef.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kedinifufajetek.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9776d0d87---vuxotis.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/loxanovoveziwegevola.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1c18fd4c---54008638352.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1e110a3c89c920972fe7ad20107fa4e3/kewovedujopibe.pdfIn PDF document text
    • https://isosklo.cz./uploads/xexefitet.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160843a3a24070---miboganemegoku.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fd3efff44d17bcb1fb026fb7792a1822/74606384440.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/5539408135.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/nozibolizadelumonexi.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/bugexu.pdfIn PDF document text
    • https://viettrungson.com/media//Files/lesefubajimoveto.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/43650743361.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/22634499379.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983492e8ddf---47294677966.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/bikelidukakeneruribolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=good+morning+pictures+lovePDF 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_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 16212 bytes
SHA-256: 7d28ec00697c135050f8e18fea001de8fff035a35cb40f648158db331e91db19
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11090 10900 bytes
SHA-256: f03a3a59d00e9564e3352d76ae799038beb572b40430866c85bbc313b732a4ad

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