Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b43aeeeace131…

MALICIOUS

PDF

101.9 KB Created: 2021-09-03 18:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b363cac44a926f0d08d6d9e7b4469bc1 SHA-1: 149e6c41dc4c309611331ab7db69049aeaddfdba SHA-256: 3b8b43aeeeace13109438bf70fce657eedd3320efb21876b59331e6c69c48d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs, many hosted on disposable domains or compromised CMS uploads, indicative of a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is being served through these links. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://irlanc.ru/uplcv?utm_term=on+immunity+eula+biss+free+pdf PDF link annotation
    • http://clipsttm.com/userfiles/file///pawakunun.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/34607284126.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9s0cse9ina6e1a734grcleguc/42180085686.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/66608897615.pdfIn PDF document text
    • https://red-adlay.com/upload/files/nuvigugibutufajokekiki.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/xanigunevugimakud.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/19807384580.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3ed24da74cc9119b67fe94a850968bab/gerukumenisinunimazidi.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/61320470281.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77d33078e---81637040065.pdfIn PDF document text
    • http://sooclose.eu/upload/File/99967029609.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/72810030047.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i813gc82mgk2havheq50uff6l0/3094582320.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/54932872874.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/80954113666.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3b5dd5a26---15392989617.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/sgqpdg22et0j9fk6f3vji79193/sukijukopuku.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/mitamu.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d78ef225c764d9ae86a1f2d19cd273ed/vitozevivanotivug.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3086e9b9---78489172058.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d986093b9fa---mokidokod.pdfIn PDF document text
    • http://apvn.info/userfiles/file/30068701536.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/79208088257.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_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 19160 bytes
SHA-256: 4cac446181f3fea1758b6577a90f7bafefe6460c2a22b7123d06b1cc5a98f080
font_01_sfnt_off0001589b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1589B 10920 bytes
SHA-256: 361057f4acca1e20ec138c592b19b6b1450666b6b7195d625510eb0e82f16ddc
font_02_sfnt_off000171bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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