Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a04e90ab6d542ea…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 20:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 725572e1f82493f0e056f438e378a1fc SHA-1: f9637dcd125dd44b95c5257eb002d6f5e5b1b84f SHA-256: 8a04e90ab6d542ea0af6e87a5f867e1ce2eb181648f72b750a35fc39f9b21c82
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=can+i+use+android+auto+without+usb PDF link annotation
    • http://bajcsidavidfoto.com/_user/file/muvilazogaf.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/69038117177.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/38195306009.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/506c4dcdaa16c3f59b1407b6725d3f11/dulexanorinizori.pdfIn PDF document text
    • https://maviet.vn/upload/files/nazapu.pdfIn PDF document text
    • http://trieuduong.com/images/Download/topozewonivajaxotav.pdfIn PDF document text
    • http://metall-press.ru/files/rupekutuj.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b267d276a851dc661706c3437e07545b/90450393833.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/giruwodarame.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zuxakiniwiwalanaxu.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/63292403662.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/31262806131.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/94876916161.pdfIn PDF document text
    • http://pnalog.ru/images/file/2363495896.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/39169481447.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/62196507392.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/29607863231.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/nanisoz.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/91c43ff0477234a5b7e916d332859b0f/5944817867.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b7e95f2d4c626a84c7072e6b4812ff37/21434527949.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/mupuvugolitupadavafupasum.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/62043313793.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/ralobobarigasaki.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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 17772 bytes
SHA-256: 358285a43124a59cf30ad475fee8183f1eb412b1c66b2005a6a9bcd89637484a
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10656 bytes
SHA-256: 62f795aaf0fab32660ec6c9fc54d441a69dd2bcdb14976f2fa1eb69a814c7b70
font_02_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1