Malicious PDF — malware analysis report

Static analysis result for SHA-256 431cc434eaadf2ea…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 13:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00b32a185f42fe6cc0ecea8e97ad576a SHA-1: 413fa9c42d088a5df6ded37195912bfe9ae3c8a9 SHA-256: 431cc434eaadf2ea1c523406c070b6d05f2ea26e6d0f4a0bbee718c6945c1c1e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs further supports a phishing or scam-related lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=watch+9+series+online PDF link annotation
    • http://budka39.ru/files/kuzurajipafi.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/94242155559.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/gimunosuwubujigavemor.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/k0ndg9hkn25310paho87i391h3/sejamawugirata.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/59696902227.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa3133d3bf---63782815148.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tugepapipevi.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/66474757039.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/nifukagizaxitutaxuxu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/76553170061.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210917_174710.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/konekesukojobumixiwawa.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/23384779353.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/69873340490.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/jamarego.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/totoxolixuzur.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eb2c0d8dae56edf9dcd7cd78be5cea94/16350625489.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/72792092069.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EEDD95F4051F1711.pdfIn PDF document text
    • https://educhina.mn/editor/files/26790271775.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/jijesiv.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/fozifobalawam.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/bagumulosaxup.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_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 10488 bytes
SHA-256: 9f45d9718df26381be2dca963aff8b3652b036490926e592a0844e5308b8ff4b
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 19268 bytes
SHA-256: b3d0b9068aec0c56c30dbf2d0c0d76691f94441e98a3a2ee45bd7353953cdcc0