Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b506fa457663602…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 18:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a6eb1124acdb3858c92b7d2cb8b0b8d SHA-1: 209dea7214e809d191b2dabff5909c2ce7818059 SHA-256: 6b506fa4576636020ec2bb601e5e990954e9da24dd80b51e6444fea20c6d4e5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://huntic.ru/uplcv?utm_term=top+30+most+populated+countries PDF link annotation
    • https://nbtele.com/en/cache/fck_files/file/xiligimasisomimazofunej.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/balop.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/31943352544.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/93291648103.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142d35dd632b---tododogekizofokuwofegopi.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/zoluperosuzerapumaze.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/xarebojobosoga.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/94989618114.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zalanozakorodim.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/duwolapelurenikepirub.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/zaniwelizevanajede.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/direrolibatujigefi.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/65851997552.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614002f755e8a---47523980514.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/10695943009.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/35995397942.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/40251706124.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/127f37f4a04c1b6eec8c528825c7ab4f/jukamite.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138099355d72---gugokimebesefakekomi.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/2635498394.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94856782323.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/xigemojikanod.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/84220587555.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/24909581982.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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 11032 bytes
SHA-256: 33b64bb99177eca71bcc8a909052b5640390a86b8f8162b4795b4b95d112900c
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 17600 bytes
SHA-256: f4a633aaf4f14340e122e21530f30b1bbce510ce049bddc9291c0f6d2654985f
font_02_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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