Malicious PDF — malware analysis report

Static analysis result for SHA-256 379e213cc6e79855…

MALICIOUS

PDF

80.5 KB Created: 2021-08-28 12:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1390ff64c17d21446c8f1c9fca37fc92 SHA-1: aa2fc540d347fc618a08547d34ca16af22d0d730 SHA-256: 379e213cc6e79855a64e6c6faafd221c7ca035e99a39e189c364de0c9a5f84f5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the overall structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://turdv.ru/SITE/files/editor/file/podof.pdf In PDF document text
    • http://ajarnveerapong.com/UserFiles/file/tasodi.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b859de5313d673c4bd586d7c29151c5b/86254874313.pdfIn PDF document text
    • https://service-panev.com/userfiles/tefubofuwenetibozak.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830abedf582---83809406778.pdfIn PDF document text
    • http://biomisszio.hu/tmp/65894263999.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/batodolakodisipevuru.pdfIn PDF document text
    • http://hangquangauto.com/files/kolidus.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pebelemejiresidudorote.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae24846c47f---mobagereviganurowogofot.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/14510540511.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/66414175957.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18a82d92cb---44892176132.pdfIn PDF document text
    • https://aildf.in/userfiles/file/zirirogixowo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210502052311565268221.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0d75884de---xufubafitow.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/tiloxoxuxuseza.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/33596173031.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a5693a3ecce---9543380644.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/81924103556.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/tavino.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160985cc300c59---20894026420.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jumibubitozefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=circuit+theory+and+networks+pdfPDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 11096 bytes
SHA-256: d791e9f377fa927bedc5d0e8db39fe0693a1adc6100ca4dab2dc2e8f6857f20f
font_02_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 16996 bytes
SHA-256: e5cbcfbaf0e31129684f683152fad7bd0c0bd8de993d88b35052fb52212d94a3

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