Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f21af92f4fd08b8…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 17:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 35669747348e895b01ec8022165ccffe SHA-1: 13536301c3203ea39da8fe15dfab688e0edb95f6 SHA-256: 3f21af92f4fd08b8dce79dcf10e8b5eebe479de18f9343ef6c3fa3f136374bf8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, particularly those hosted on compromised WordPress sites, are likely intended to redirect users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dinskayarealty.ru/media/file/jigugakuzuketexu.pdf In PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/fatanujuj.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613832b907f08---48881344987.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/fusam.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b9f04a98f2b70b910e015c862774a7e7/mipefako.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3980b266---63886700722.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/88825518272.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98368782078.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/17091759113.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/kajime.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/4738448060.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/xuxapefobiponifafaxapo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145664a789fb---xirepoboverasumu.pdfIn PDF document text
    • https://cncunse.com/d/files/7690282932.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/43745672996.pdfIn PDF document text
    • http://getsolarny.com/userfiles/file/gofazozozikufizep.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/budewewemaga.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/doraxewuvemevin.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/41864215904.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/40928792393.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/gesununapav.pdfIn PDF document text
    • http://elitk.ru/_files/vorekabuwozibumifunepumix.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210915183943321.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/41794651714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ullu+app+hack+version+downloadPDF 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_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 16040 bytes
SHA-256: 917522a6237a42172c1b86fca30adec6bfe292da9d4fe170c9ec5481cb454bf9
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 10864 bytes
SHA-256: 96bb664bfdb387e52ad85acc3c398c97c3756283dc87480b648646512b0f52e5
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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