Malicious PDF — malware analysis report

Static analysis result for SHA-256 8082b6bc1b9cd8ef…

MALICIOUS

PDF

80.5 KB Created: 2021-08-20 17:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6498ddda4120caeb17c40cd6b8e7fbb1 SHA-1: ffc8daa13879c9373d38ba7a7a3b4d6f78ccfe35 SHA-256: 8082b6bc1b9cd8efc7e818ee48067a26e247e4c6d928d454534c109ac3191762
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gursakaryahukuk.com/images/file/61584643210.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d0d648ff81717ebf14f64f743aa9a333/folezemegitewotidewom.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/27048546584.pdf
    • http://minhnguyenvn.com/uploads/userfiles/file/91061223443.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gifil.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/9c2220523edf5dafb23618a5e5c364a5/kudolegegafujadekalula.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nuta6n5ftp6u3bgqrcb6kgopu2/wazikegakolejotopo.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/kfqjchcg4jd01nducpe6bu385q/77221989871.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/vadokekinaxerefirud.pdf
    • https://nepalimodelagency.com/userfiles/file/54934698031.pdf
    • https://dom4m.lv/userfiles/files/9819648095.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/zovukeraxim.pdf
    • http://ipllaser.in/uploads/vazonasijaxanunubafosevu.pdf
    • https://netiko.fr/img/Data/file/21173224067.pdf
    • http://tunglamgarden.com/images/fck/file/71523851644.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fe590e5ddf0380f3f2a5c71d27f245e/51692071053.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083487795ffa---57222762018.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/dtpkjvv2odmjtjslcelapjrp5f/86010737789.pdf
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add8410a7fd---morewamutuwelixanageto.pdf
    • https://jokerprod.net/userfiles/file/90982259046.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=libro+de+matem%C3%A1ticas+sexto+a%C3%B1o+de+primaria
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d210.bin
7e89cdd6cb80f6c408a7d0ca2498155f68870e49ab8d75225998bacd1e4be901
pdf-font-stream PDF embedded font (sfnt) at offset 0xD210 18216 bytes
font_01_sfnt_off00010098.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 16792 bytes
font_02_sfnt_off000118af.bin
4c2ed8a74b1cff152ee9c8c7ed438b4ce59fd7e5d3002f4cc9891c5facb3c412
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AF 11112 bytes