Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e52b9d1e05cb718…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 19:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef8c2e0e10754aee8a5dc67a6612d16d SHA-1: 3c19a2a46f7442946a64918dd6da094baf79c010 SHA-256: 0e52b9d1e05cb7183700b42b70f61630dae476068d91047a4c14725cfb385d62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=sharingan+live+wallpaper+gif
    • http://capthepcongtrinh.com/uploads/news/files/fusox.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613324809e576---julomi.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/13983670498.pdf
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/12459108306.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161321a2f0019c---99825421743.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/gamiwapoluwovejexuni.pdf
    • http://sake2metustin.com/uploads/files/dumelafamagewujawonit.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/vinuvunasan.pdf
    • http://2222.netsociality.com/upload/files/lufiveg.pdf
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/97425142910.pdf
    • http://slsnn.ru/content/file/87862647804.pdf
    • https://doluhosting.com/calisma2/files/uploads/sagoxiremowudilisezu.pdf
    • https://norservis.cz/files/files/38224822917.pdf
    • http://lab4050.com/upload/editor/file/3967064828.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pmtll54nuo903a1s3hphij9kmp/82991711101.pdf
    • http://vegman-kzn.com/ckfinder/userfiles/files/tapilubikulumifebav.pdf
    • http://nuuts.mn/uploads/assets/lekusuzojaxuz.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/7168814744.pdf
    • http://dagmar-e.de/userfiles/file/losawupi.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/puzipujenegexiralurip.pdf
    • https://cytokin.ca/upload/editor/file/34975482123.pdf
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/76116093626.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/31783124863.pdf
    • https://blnk.eu/userfiles/files/94278268314.pdf
    • http://studiopol.com/userfiles/files/jetonig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd7.bin
957e99a281baa05facfa0a8e8fbee908afcea54837670595b3296ba63b171969
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD7 10476 bytes
font_01_sfnt_off0000f39e.bin
028f8e0a97abc869f884d09e300c3e61a3e1e41a514473ac9edf9fb3e854a12b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 17220 bytes
font_02_sfnt_off00012077.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16792 bytes