Malicious PDF — malware analysis report

Static analysis result for SHA-256 077f45dd529498ab…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 09:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7912e5890f3b2c302bb0486ec779af5f SHA-1: 96d699e6c2a86b7e9daad96e700f3fb8a0900150 SHA-256: 077f45dd529498ab3e4b19219040a55ed592f14849341843ef6a60768f14615e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=cute+wallpapers+for+android+tablet PDF link annotation
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/zopopuvumij.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/49104889038.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109031838367064.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/07/ruxafu.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/lixinakug.pdfIn PDF document text
    • http://minhanh.com/files/99361692711.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/xavufa.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/175467600.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/pupujirewunoletewe.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/73015264932.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/jufevoziserurixolazanon.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/pedebuf.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613F01B0B4064.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/25171082370.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/18559259449.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5pji87basscdsmibcl4q3g0fa5/80655357004.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9a8e918ef---wekedavurokilogis.pdfIn PDF document text
    • https://basisnomor.com/contents/files/96110385031.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/jiluxuzezox.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pizivuvizatelogovemeku.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134310814b9d---beleguwalaxa.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631193646.pdfIn PDF document text
    • http://attlas.center/userfiles/file/25782234012.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414a6397b9e---sowomopow.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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 17608 bytes
SHA-256: 6387b9144f31aae4949d8ebb4c2734b1cb02278efa27ea62771aec434f6a624c
font_01_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 10848 bytes
SHA-256: 8047b4cf93c64903b64616d6a884881c63bf6b8aaaf1dda953b62fb5c362b2b5

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