Malicious PDF — malware analysis report

Static analysis result for SHA-256 280a13a457a7d6b3…

MALICIOUS

PDF

76.1 KB Created: 2021-10-07 09:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 000a5aa0e22b15635cd44196b1c641d0 SHA-1: 5d2498573b3947bb0bd268fcf018ebcc582fe4b5 SHA-256: 280a13a457a7d6b3acbf2a8ed6583346792af4ad9cf5715436e5c8b8ba879edf
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=handbook+of+statistical+distributions+with+applications PDF link annotation
    • https://www.rougeindigo.com/ckfinder/userfiles/files/70851514930.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/gevobixenawil.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109101054162027.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2c45bac09b475ebf99b1b2f81d31610c/47477842681.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f912a343---nabete.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/jedufexapifibonadaxupa.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/karule.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/11069201248.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/3603975206.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/57985699554.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/28395602835.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/54166013646.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/rolubilurovezeromew.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/tufif.pdfIn PDF document text
    • http://foodchemsino.com/d/files/famanimosalexax.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbcb043bb5---jaropo.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/22993699018.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/50795790488.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16158970f07faa---14563398716.pdfIn PDF document text
    • http://liily.jp/upload/file/20211004153713.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210922151750.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/67ad1658b16dce479c6f89f6ed030c43/98716485253.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jiwivotoxakizag.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_off0000c35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 17392 bytes
SHA-256: c0aff761f6c40b123b258b11cf1d011b0daf302c0aa75198b7a06e5cf6f02624
font_01_sfnt_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 10996 bytes
SHA-256: df8022383d5cba09a48d459ab44632c20d35ef329459aca4125f421da4c0c8f1
font_02_sfnt_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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