Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cde05afda9d95c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-29 01:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2bbddd11ff922dbcb697cce5fccd227 SHA-1: f562ac1f88a71aa488374cf7fd34c5e15c566687 SHA-256: f7cde05afda9d95c850a83d85071ea972ded99242faa55a14d18071eb9cf945f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with lures like 'internet download manager crack 2020'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=internet+download+manager+crack+2020 PDF link annotation
    • https://stopserv.ru/files/file/40885970654.pdfIn PDF document text
    • https://vitanov.rs/files/parolinaxawaxikidogunas.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/nenik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/uaktcsobmvculthmv3k32nd5v3/81314358804.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/kijekilopim.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/9076949181.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/dewegovosuvijetozej.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/84891985423.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/56099869860.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///bunupefuvubejixoxef.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/80935098677.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/86923151689.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/zavijelivumisudavirul.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/67534171375.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/54476786022.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/aout3umne6s4q4ml5oaegp43od/60451086435.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149e40b5cb6b---55702412405.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/10205398419.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bupekawamoketifivove.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/31225801293.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/77799939536.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47984284740.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/23780806516.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE0 14860 bytes
SHA-256: 697092a0a16892cc8a54e384b9f9ae6012e557b67fa465038116a32bbe213648
font_01_sfnt_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000104ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10824 bytes
SHA-256: bd5177b7a04d175d3a8505aa2be2d8f00343e7509ee15e224681a6c3096de878

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