Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3928d9ba7cf0cf…

MALICIOUS

PDF

79.0 KB Created: 2021-09-04 20:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ec27e0d6027e4cd6e3c3ffaf48069b8d SHA-1: e00a6595e92399e3dfef08c836beb91e0b80a843 SHA-256: ea3928d9ba7cf0cf19db3b8a708d796dee0302bafe8a4b8e678cf88115ebf921
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and embedded URLs are consistent with spearphishing attachments designed to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=greek+and+latin+roots+worksheet+5th+grade PDF link annotation
    • http://bayanairag.com/uploads/userfiles/files/zetumupifavezarenafovelep.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a447f9b4a76---86114605604.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f5f7023ddc019c754aae4ce7e506b2f4/63619213674.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/zonidasudelitezerud.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d35f512aa---17115493257.pdfIn PDF document text
    • http://vhktn.at/images/content/files/bovosiwa.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/62904078897.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/62787973604.pdfIn PDF document text
    • http://lyshiying.com/d/files/wizora.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/mesedolagixobexeparodosi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2b1c8c0dde7bb63181b3d2a14ec01c72/fapinij.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/882c68f068008bde3f22b8b25477d3d6/fiviwime.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0927f9496b---69113076147.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45594a22c6---14124945799.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/92852507553.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c388e859---55831483203.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/xinaxakovipegul.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fd363ba6---61802216665.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ca10631fe---61734454298.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210808_08052CDE89D91CF3.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/40916708542.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/21906678053.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f852d79ce0---26071470861.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/xopelazevavawonasup.pdfIn PDF document text
    • https://negaratoto.com/contents//files/dijilotori.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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 17044 bytes
SHA-256: f8c26985bdc35f4f7e6be23b0f5e8ef6ce722e75948987bf1fe5872b51ea4818
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 10880 bytes
SHA-256: 09d4a433413b528af980c4c35351cfd2ce63ea71e74310458445657945c58d7a
font_02_sfnt_off0001161e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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