Malicious PDF — malware analysis report

Static analysis result for SHA-256 98475e961ba1fc09…

MALICIOUS

PDF

104.0 KB Created: 2021-07-19 00:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16bb7c74ffcc92b249d7569b7db50c24 SHA-1: db097896056415bfdd9e34d40641522d60f64fcc SHA-256: 98475e961ba1fc09e5bc190eb126fe81d4b54467bd10b91066197f889473b70b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to malicious content or phishing pages, aiming to trick users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7913e9be84---3724482798.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3af189ade---korilugajisa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9482236741---14831364386.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/tujawotikixefi.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/147110277.pdfIn PDF document text
    • https://btegypt.com/file/ramemunokefodaxila.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/b18qbm8c6knjlun3vroq5l9bfj/53231990262.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/latikid.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/cb278b928aace087a1874908748b6f13/senazedilulul.pdfIn PDF document text
    • https://tecnicamistasnc.it/file/joliguretifumofigus.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/14875891554.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8eaf638389---10607249266.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6ff829f6---97949034295.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc738fdf---35170460063.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a05887730c---rodotidakiwezofi.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1e63d2f6f874230a84229a691c2bda5b/64923922757.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609631ee6f7bf---10539478755.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/42083035365.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/nazer.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/zesisevijawagegofogaxa.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/xapolexazegabudadalet.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/banasinimevapo.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23028455003.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/fitakol.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021061602165270554.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/pajixidokubod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+fourth+wise+man+full+moviePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001798c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1798C 16888 bytes
SHA-256: 65ec3de44c6767b8e65203987ef3fdcb051680f0a6e754af9a448a5e13c569ec
font_00_sfnt_off0001194b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001315d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1315D 18012 bytes
SHA-256: 1df1c986f2e620fa6eb70621cceae5d9d98d39258267010bc71b81d647da2747
font_02_sfnt_off0001611f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611F 10696 bytes
SHA-256: 5ce3e5a1632317bb06b757d6f5089e8bbc997bd0eb3890c8444be9801786cb42

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