Malicious PDF — malware analysis report

Static analysis result for SHA-256 984f4ad2a738fb4f…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 20:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddfd27a30260515f6ec1e3adbf41e682 SHA-1: c6f9ac4094da5dd52599dc86b31b29f3863afd02 SHA-256: 984f4ad2a738fb4fd5d963b0419044c3c63831e86441d624858841565c769df4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=best+wallpapers+for+tab+s7+plus PDF link annotation
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e4a075ad8af46ea804f2c2e635efecf/46181644332.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/zumemapokarewaguwosoxasex.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/megoxafegi.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/13196944057.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/88522940093.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/nakebe.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/fubobedupobokulu.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/ganalowovosonamamakoxepo.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///kugegumamesonibozapiwe.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/80981742431.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/filububivuguxopuliga.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210909205037.pdfIn PDF document text
    • https://svltv.in/userfiles/files/25285895556.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hppo6i5aduqfnadi2ti1fs72d7/42397084141.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/sujagezagibokobadixoluma.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/77928662304.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xodelasib.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc295ee503---47470453687.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/84553849233.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29030033110.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/kaparu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7bc4d9f458d47e95a8c847ad3b513ffb/67607261472.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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16740 bytes
SHA-256: 44a33610b80e53037b46dd61e38f8ced7cd749b4cf2ca32d07d47183c045b1c0
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 10584 bytes
SHA-256: 9be4a5c90892b62ad787e99be6d5d9713409203db67962d12292cea102e8c9d7

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