Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bbaae863f855ae…

MALICIOUS

PDF

97.5 KB Created: 2021-09-07 23:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 790c2d52ea839e759d7774d5d8922e45 SHA-1: 78b88bae6131f150ad82bf2de7c933274543db47 SHA-256: 76bbaae863f855ae40b745c75fde91935bb7c167d39aa894875fa63995e7ac6b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=b+braun+dialysis+machine+manual PDF link annotation
    • https://toyotaautobody.com/ckfinder/userfiles/files/bukupizuwixarap.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/90609432228.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/riletojejojolekonidibat.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/megezarabiberatavowoko.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gosunidojoxaparutevu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/973hh8mkjsq4ofkpulijfncpc4/futigu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bavozasofukokufon.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/59759741307.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/73056502205.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/44854654193.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7a7e0cee63ac906ebadf2839574a8bb6/8701314233.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/naxetugadonurikod.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/49899496893.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/puligezejed.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lfj9bmbvbnomhc2gfp3a1fhen9/segevafatiwupefav.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/83590088844.pdfIn PDF document text
    • https://coil.hk/upload/files/lolikovarobasexezij.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210621_9C3F9DB8F3C1E8DD.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5702261f49---95484531918.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/gijidivazoparu.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/26371227084.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/57841026702.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_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 20532 bytes
SHA-256: 34ff0b1e4e9da9d62917502c5f447647523ce4d7c1e58403f42956ecfe177d0b
font_01_sfnt_off00014731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14731 10824 bytes
SHA-256: 16a67931cfc3dea12d7dc96b688a1d1cec343a6e5ab5592c1fea76b22de3d114
font_02_sfnt_off00015ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1