Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade119d2e8092ef3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-15 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eca7eea1b6ac461a823beb2d0cb76921 SHA-1: 8a4822e51a049f15220ed5261ab7ac6c03ca7098 SHA-256: ade119d2e8092ef3c99c38258296242b7a2c213caa17a8ec7f2c97d9c64f85b6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. These links likely serve as lures for phishing or to download further malicious content, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://enotecagaribaldi.it/userfiles/files/dubetajodan.pdf In PDF document text
    • http://edukoc.net/userData/ebizro_board/file/85409416147.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/damuko.pdfIn PDF document text
    • http://mobil-tech.com/files/vadibikez.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42f8d1168---4003209771.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3f4a9552379f97c25d2648801b088f4c/bometofapaxaj.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb5e7f729---xugijimexutobebisubati.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/binevuboloritazaxeko.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f8d8932cd8c5c1c9dffabd784d4efee/tiravemugibeja.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/27122522858.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/51407121832.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/26158854995.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/juxokarupetudomotatokuram.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/21896359169.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/f5a4d265d5c600de1351ed4aa113565b/gabegizepijuledeka.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/rogorasukoribavinimoti.pdfIn PDF document text
    • http://bearings.vn/images/ckeditor/files/kakezumegigimolusamevuki.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/fizeduteveximiwug.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/bekazugeduwopu.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/47542552962.pdfIn PDF document text
    • http://moretonassets.net/userfiles/67130682680.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/denuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shk+sports+apkPDF 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_off0000c8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 10140 bytes
SHA-256: 9e107a5a38d2e1645df7dadc059d48ea19f071ba552735e7f35f1aea6be81506
font_02_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 17784 bytes
SHA-256: 48c80a035917ec772fee120964caea773c0726b7e03cee8360f54db790421ef8