Malicious PDF — malware analysis report

Static analysis result for SHA-256 793fc5f7aff7337c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 11:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0731e9fb4fb4dfd27907eb7cc8517ac0 SHA-1: c9169b3ab4c81190d06e98605a5fa0f92474e22d SHA-256: 793fc5f7aff7337ca12cb5670ef33e419ce04c4c4a9f78aa6d7d4ec696ff2b6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were directly extracted, the nature of the links and the heuristic firings suggest the PDF's primary function is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://cructi.ru/uplcv?utm_term=there+is+no+personal+hotspot+on+my+iphone PDF link annotation
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/66608447019.pdfIn PDF document text
    • https://orangerun.re/photo/files/rujubuv.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/93539929395.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/11089884231.pdfIn PDF document text
    • http://santeh.md/img/files/69942500789.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614130bba2718---58699731575.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/91311589058.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/21228317116.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6f13821a---guvukuriwib.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/51867424406.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/taworafezeb.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/paxunisekure.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/70986084961.pdfIn PDF document text
    • https://dcimx.com/files/90543329237.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/wepififeniwimakapifotolok.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/7489148166.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/9260534613.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16135820c4ac43---fovikomapireritoxemug.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/paradifisejil.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_005715.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/10994998787.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/33974885757.pdfIn PDF document text
    • http://infosierra.es/images/editor/73136905950.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/tisuzogunorarozogadipofi.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wisetefil.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/13019494476.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/gofifese.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 17176 bytes
SHA-256: 648e6de1be8dd2f2b2d622286820f7f2e098319eb0cf07067aa6514f2f03b82d
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 10596 bytes
SHA-256: 21106004b7271cdbac595aca47f6e1e27592a37d7293b1f7ec5425ca964c7424
font_02_sfnt_off0001083c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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