Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca0179da95a2d3b…

MALICIOUS

PDF

101.2 KB Created: 2021-09-10 11:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6405cd60d987f31d31dcb4e08b8290a SHA-1: a671b94a9ca45f517e17b6148c4ff2f06f0a1f40 SHA-256: 9ca0179da95a2d3b204da8a4b95cefccbd33ef30e7b22b7d8fdb6befe9d659bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a potential phishing or malware distribution scheme. The document body is unreadable, but the heuristic firings strongly suggest a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://saigonservices.vn/images/uploads/files/gevudatonisaru.pdf In PDF document text
    • http://malovanesklomh.cz/images/file/80483202127.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210905_224604.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10763027475.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/87903999949.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/12045809709.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/447cf118033953988a5fb6a870f4d3cf/86191258340.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/66556420179.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/jobivuninuzimujo.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/semuvusewuke.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/95022276916.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377114055b3---zulugamizigidel.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/72603431988.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/zobijox.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sotigupududenuzufazopilel.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/runexumetamefavopipu.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/5177598408.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/xajakekakagifedad.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/26657114559.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79d3ece0f---jesafigafozebade.pdfIn PDF document text
    • http://airsoft1.ro/files/file/gogavewubirobu.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/xurororenanafikaruzenepi.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/medufinedobo.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ec7f73cab8eb03010fa1230e45dbc4dc/mobekurugodasu.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/pozawizurekojututaneg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sprint+htc+evo+4g+android+cell+phone+black+without+contractPDF link annotation
    • 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_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 18812 bytes
SHA-256: 490f7e5661aa26a5b93c744280c66b9f7511966f7e70328b91836227bc4a7a02
font_01_sfnt_off000154e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CFA 11264 bytes
SHA-256: c5108731a3a935e9d6111059a737a6fb1667f859cd5d41e8e356a195f9b9046c

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