Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10dd254272c7944…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 20:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a68e2178100755ad16090ea2e39f528c SHA-1: e53c5b3eb91265422840632786a17777ed7a4e6b SHA-256: e10dd254272c7944454dd7aa4198eb64c91112805854c8aa88c1826cef8b1ede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The file's structure as a link farm suggests it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c348dd464---44638342963.pdf In PDF document text
    • http://skisun.it/userfiles/files/25266953602.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/73196500355.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/mirexubijumojumojubezu.pdfIn PDF document text
    • http://clerus.hu/files/file/37567516756.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/belosevibuma.pdfIn PDF document text
    • http://inphilong.com/upload/files/89776166002.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/48392fee6cf3d176913bef6104e58845/medibavaxetavojoj.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/46012707096.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/86942517516.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/15030917778.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/6c816c51ed6572251cd6fe64b55a1703/71309893048.pdfIn PDF document text
    • https://brs.jo/userfiles/files/rokikewoxajijowusiwi.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/waxosibibizarukezexelika.pdfIn PDF document text
    • http://teakdeck.pl/files/file/kitagajigefuravesebo.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/vebonejebibopiluwe.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/63257214283.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zubupinufesunelujesuj.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19263575962.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091301180670554.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/lazipin.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090311542473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=add+chrome+to+home+screenPDF 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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 18064 bytes
SHA-256: 4945ba6f41cb89a34baca3b18332bd0ef0ec1d271ab593d367627597ca16196d
font_01_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251A 10316 bytes
SHA-256: cf75571e6106e33ea4f6a8808a7b25f0b7d6b29269fe5226869beaa6a99b2462