Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c053fa2b31e9a7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 09:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfb82b26e819944b6e12ba459e40e3a1 SHA-1: 9dd1da74d938bde5e3de1e3f20f93b984dee6c32 SHA-256: 99c053fa2b31e9a7b16edc31adb54c0d16dc4be9e8cc2b0df90d92cd3858f6cf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://oniceh.ru/uplcv?utm_term=file+sharing+app+for+both+android+and+ios PDF link annotation
    • http://avon-bratislava.sk/files/files/26376423990.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0607d293c34c782442aff24c7ef24d58/lutalegitubijajolo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4e07407c30e40b642487c51835b7e9a5/nuxakuwajijegisa.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/71792162609.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/japibuvenorumupujesere.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/89859806749.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff69b22a62---9789432425.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398b3448b---49394189823.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/jojizu.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/62386038165.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/44c4ed8dba820e57f908ab5e0828c6a3/44041642518.pdfIn PDF document text
    • http://cycling-software.com/files/file/jigilagefo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388f66c7511---matalutemikikuw.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/gejabipawunaleririz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6809acda1---saxovepulu.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/mepukeraxipupakukasugom.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/nezexenoxamugofat.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/butelisafefixorir.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/tilidotifeku.pdfIn PDF document text
    • https://forssh.com/userfiles/file/40845199236.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rerarola.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/tumedop.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/60438940489.pdfIn PDF document text
    • http://quinta.cl/upload/files/bedarosaza.pdfIn PDF document text
    • https://rotitelor.com/contents/files/denobototiliwi.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/minuwefivu.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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 18340 bytes
SHA-256: 35eded7b46019bab1251b80f7fde44f274a853dbf50d8ea76db81d6be3026403
font_01_sfnt_off00011812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 10896 bytes
SHA-256: 05bfb893a1120d2afed96f69b1b741bc65b78bb9350ffaef51e026826c5d6d0b

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