Malicious PDF — malware analysis report

Static analysis result for SHA-256 5caf7c0068e1a315…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 13:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b96820d88e68a35bd383cc9318313d4 SHA-1: b852159c215d826f2b27cd5de8255a05658c5245 SHA-256: 5caf7c0068e1a315d9e1949d797d3221efce9b55b329b79c8e2575f0c2ff6600
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cec88edb641149b09648b3f46e3c987/71221331336.pdf In PDF document text
    • http://palaciodelosnavas.com/userfiles/file/jalegewodono.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fenajozogavimiranoliti.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/550429408.pdfIn PDF document text
    • https://aneri12.cz/res/file/dawizipoxijemimi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/96092314597.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/73518982529.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec9e55698---82694802606.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210531021832.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/jarovonanexiwapolis.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/matekikipidop.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/2921902740.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/jazusidixore.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/0vsvt8au76s0mnkj8377uuem96/99160611239.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/setuwurote.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/74243146719.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984833b35cf---fivapuneradowezexezitodi.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210626065740.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/2i85065bv0hu4m6vhg287046l6/72891399283.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/34673213822.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4d9dbdf9---72557309504.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aee5cb090---zevavuxojepev.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vejaz.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/72109226157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=it+tools+and+application+book+pdfPDF 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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 10564 bytes
SHA-256: b4cc5aa1d828e8c470f804e37f49e4baf4eb57a453352770fdd0044c15f2d925
font_02_sfnt_off00012052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 18008 bytes
SHA-256: 99d176de60413d0fe7b6b2d624789d86f55c43eb74fc9a03b625ae3972738de2

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