Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a07b54e44eb6303…

MALICIOUS

PDF

81.3 KB Created: 2021-08-12 09:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cb7fb9bc0c0925713d480899e32f005 SHA-1: b5bf45e402d184da83c637f15a538a9866ee95d0 SHA-256: 0a07b54e44eb63033be65b395c4eb57fa6d184e9288de9b1528e5699c975987b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=interchange+fourth+edition+level+2+pdf+free+download PDF link annotation
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dududolikomeliza.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/dajapivalogepuma.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/11212575486107cdbba28d1.pdfIn PDF document text
    • http://usmleworkout.com/files/file/netadogelidejejen.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/zenigekenegilovipopav.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sabuwezapumarosetuvijup.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/58991008692.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/49mqj45i122c6g4f30loemrac1/56188893276.pdfIn PDF document text
    • http://cloverdiamond.com/file/83394202193.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/96333151678.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/59071140123.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/jesanolaluw.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/peralefegi.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/durimanixedewoduluxogiw.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16072325a241b4---1371192465.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/49353399518.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9a54b646979b8ee0739dccd7b0adfecf/9464432515.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/543ab10baececd60caab66966fa8775b/15168777069.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/57133960088.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/846c0b7ad6346c05e8f6641f719c42bf/furixanini.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3cace1e3f---furapusebafemoja.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/47141579721.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/39bacce6f5fe2c684fbec3f9c8165d31/visanugaluwimaju.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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16828 bytes
SHA-256: 83848576ba50965797450bb23e28f7861ba3f1f8ce27ba170c0fa2ecb7f1ec2d
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 11052 bytes
SHA-256: ee6ef22202c407b1dfb618b857cd18594dee0d533702f0aea7a305c2f432b0a7
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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