Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa22c7e7bea747e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 03:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c991d5565aab58b25a94481087562672 SHA-1: 3fbd7d6921438f8e5480e550ae285255e4bf76c7 SHA-256: 6aa22c7e7bea747e26ff325ef2a002183f1e1fc9191e4b7e445d2f80669f6f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=android+performance+measurement+tools
    • http://giorgimpianti.com/userfiles/file/vofoji.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/38068873110.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dd1vrg7s0c3tkalm7vj0if8ti7/93189006310.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-14/20210914072109129897.pdf
    • http://mizuho-co.net/file/ck/files/vafulaboj.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/35054662225.pdf
    • https://nacituran.com/userfiles/file/94455312772.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613020e8aa35e---vubaverow.pdf
    • https://travelworld.ro/userfiles/file/28349260647.pdf
    • https://autosaloncenter.com/uploads/files/28870817963.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/disek.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/nufovoxenetitipox.pdf
    • http://millionsdiscount.com/mo_images/files/95980503597.pdf
    • http://normel.org/files/upload/file/tebuloxe.pdf
    • http://brilspa.ro/userfiles/file///44350827751.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614677e3b118a---lewirurule.pdf
    • https://planningpvedh.nl/ckfinder/userfiles/files/88757292295.pdf
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/42457569649.pdf
    • http://stevis.cz/files/file/xenokudotomemap.pdf
    • http://taigesw.com/upload/files/vixivudizo.pdf
    • http://urs-certification.com/gais/image/file/taleworuk.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/fisadu.pdf
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/kasopovoxetilidefo.pdf
    • http://bio-scan.com/userfiles/file/49186130908.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0ab.bin
1d39ed85484d30ee5d4d68824b14425cb6ed506476f765fa826cfefd6f6d4724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AB 18464 bytes
font_01_sfnt_off000100dd.bin
30149c33ab9d9705adcce4199c7eccabffa3b769d7917a6564dcffbbaa4d85a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100DD 10864 bytes
font_02_sfnt_off000119f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 16792 bytes

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