Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f7e9854246298…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 14:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 996fd798d9797dfc5cceb819e600b3b6 SHA-1: 4894015870818570cd8207541084145df832e68b SHA-256: f24f7e9854246298a252998ed217b0c247e207cb507ff31efdfddff20dbb3e8b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The embedded URLs point to compromised WordPress uploads and other potentially untrusted domains, suggesting a phishing or malware distribution attempt. The PDF structure and the nature of the URLs strongly suggest it's delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://sochi-vitrazhi.ru/ckfinder/userfiles/files/danejolekudisanatirajuko.pdf In PDF document text
    • http://montesantangelo.it/files/files/subebozikevitepi.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/fajukatiralafiwoledimoga.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/lovesutijifuvuraziw.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a0388917c---49480375770.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/rekonopitamet.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d03016ca7e5---34977623728.pdfIn PDF document text
    • https://mnlex.it/file/8203838446.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/54975960534.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0485b8d1f4---81411322753.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/99320731358.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210606035410.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/zuzekaxanebajofajefozaji.pdfIn PDF document text
    • http://szwygs.com/upload/2258816815.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/jajizokoduxof.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1vdlf42dkctsco1lo98r179pe5/71456159298.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/k5r0upfsjr1mfjlkirettj3nff/52743029236.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80995038122.pdfIn PDF document text
    • https://activepymes.com/pub/file/40653482667.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a91e5e843c7---2744827723.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ab7c6962---23261955139.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/vepemadorapovevutenafeku.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ca693292365d71414869269f2467ef91/3020100638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=songle+srd-12vdc-sl-c+pinoutPDF 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_off0000ee09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE09 18896 bytes
SHA-256: e133efdf14fb66f0021c0d84845bd65466f5d77b62fe21b2b334748f57fe0c52
font_01_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BD 10976 bytes
SHA-256: da383ae6b4ee895614d3f16925e8b3e6a3c0426bac5faf0029802ab81d960fd9