Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a6ed3317af371f…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 00:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6b7d77c2e920be002dd484af4175db2 SHA-1: 2dc5cc57b4bc5919fc657d1cf53d4358ba4f920b SHA-256: f0a6ed3317af371f4115ca89f93253274531b4ad458cd8e7bbd5d8d74076345c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the structure and URL targets suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4a69559c46aea4ca61a697cfe6e7b081/tarejamaveravoja.pdf In PDF document text
    • https://grup-insaat.com/userfiles/file/59244223109.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/47a53801de1d8a9fca2f4adb61ab5c89/gidebinapijoxo.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/51015562877.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/zefaluzusuzulok.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/67868889516.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109011652245610.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mawaxofovononematuvo.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/20412336813.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-16/images/files/wokamibu.pdfIn PDF document text
    • http://kim-clark.ru/files/file/1809173291.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/68148577128.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161365da089274---naxevupenufukojewap.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e83429bdd1---rizupuxemenutuselidovamiw.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092813054398.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/fagixenukagusutinizixez.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fedopokutonizetagogef.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/41513522283.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/ralara.pdfIn PDF document text
    • http://mega.kz/media/upload/files/5836996094.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631959281_e4627a72a2.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/39530281232.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210912030234.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/4679176068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=venom+movierulz+teluguPDF 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_off0000b073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB073 10316 bytes
SHA-256: 7b113cc3f6837cbad4476337b4021aa5bc4d040e50de0906423ed0e9e02694c6
font_01_sfnt_off0000c7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 15084 bytes
SHA-256: 4723fdae64f0cfd735a5ac4aea9940cc06347fc03ac30554345275a2c93c44c0
font_02_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1