Malicious PDF — malware analysis report

Static analysis result for SHA-256 8835c6123d07d493…

MALICIOUS

PDF

85.9 KB Created: 2021-09-16 07:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 137daf59202cafb074d7cd2c24294066 SHA-1: cead5c68489829066580164102f690a499b786be SHA-256: 8835c6123d07d493cbed1604e081afe747e35f43856a38b36efb070f211b2ce1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crewmak.ru/uplcv?utm_term=comet+in+july+2020 PDF link annotation
    • https://vannordenvastgoed.nl/userfiles/file/rafesosepazubugebidot.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/vuburomivojib.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kibenumesuwakelaxefefate.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a595d5b28---jalitubuferezewalo.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/moforafedu.pdfIn PDF document text
    • https://phm.vn/upload/files/48249150848.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/ketajeraku.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/71223338814.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/pawomofudipimaxowunetuvam.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/38594437687.pdfIn PDF document text
    • http://flomojapan.com/upload/files/57527160989.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/75795861658.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_201153.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff98d1dbd5---wunakarigebadiwexizujana.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e01a20c8aabb33c139a35f5234bb2121/6453658086.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9aa8cbe77---25843883017.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/worafozonef.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/paburele.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/vanuzilesas.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/72934217909.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/61001696138.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/robirap.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_6921708743A86DF4.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/xipukezofeso.pdfIn PDF document text
    • http://metallpress.info/files/53988506715.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 18760 bytes
SHA-256: 678fbeb3375b33a928c6d9ce78dbbd3e3d1bee696c1cc44a3d341c4ea1ec96e4
font_01_sfnt_off00011ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB1 10456 bytes
SHA-256: e727728fc666a9dee72f3fdbb12d6a8d82ebcec98aa21c0b24d04bf618e511d4
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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