Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff4fedb74f76e96…

MALICIOUS

PDF

82.5 KB Created: 2021-09-29 04:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4637378159bc81a4bb5d5c5b23634ca SHA-1: 9883e87ecad37b97a6375f2bee0ea162a09c2326 SHA-256: 4ff4fedb74f76e96aed8f40cb422e1c49fcf876b4908709f2e51d91795d09416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various websites, many of which appear to be compromised or disposable. The presence of multiple unknown PDF links suggests a campaign to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/lugakekoforofuloxe.pdf In PDF document text
    • https://kede.org/userfiles/file/toxitataperoxa.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/73636532915.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd7b5eb1e7---nudipijipolegipegezudak.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/76600866340.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/82459410569.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/85592426824.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/99004649245.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/robaxomerilevida.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2b041008133f4e7260e85bb65201aaa2/kujovobedowew.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/55611532977.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/7222053669.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/22654932506.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40736683586.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/25887373877.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jijebunosovumobamadize.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/95136031436.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/36228977517.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/12144258746.pdfIn PDF document text
    • http://webs123.com/userfiles/file/59065232563.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/87680757796.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/zilanukawekubenuziguwov.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a81856ce5cf8fa56fa70c10d917c53e/61443693889.pdfIn PDF document text
    • http://harlit.com/upfiles/file/67298339152In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=soura+bible+pdf+downloadPDF 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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 10628 bytes
SHA-256: 561d1ba672f34d9f5910b331e6aa83b08ae7b2a7cf39687be93bb6db1a00d0a6
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 20492 bytes
SHA-256: 38b8223d83e0d08a1e75c7df5e0fc2e1594ee6bd25b70b212c896c4e898c97ec
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1