Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85e5bc8d9d5c2ed…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 20:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a5bf0b718de7256cf190f3590b56c8a SHA-1: 1f381786a0f076cfdf237c991cfda0149f8d5dc4 SHA-256: f85e5bc8d9d5c2ed944cd3c4161aa2f92329a9576b6262676239d78cddaac17f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://evevoyance.fr/adh/.-/file/lajorevikuxofimabalafajex.pdf In PDF document text
    • http://jjburgerut.com/uploads/files/luwefegegovu.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/japedorejebu.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/75163281607.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb95ee3ff8---63863193872.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/7622106562.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613831ddcfa97---texoramuropavenefemozewuv.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/julepakogalunexasoxiko.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/lavotudusuluvi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/3412567201.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/bamokigudibivej.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/bekowutugolufek.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/66816898332.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/71269917083.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/nivufuwisezuzurijizerozop.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/kesunopowuvajoki.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f359faf8b8---kebosuniwexarogotobab.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1fa1aee9---mukusizanifubeb.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/guvod.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/10129878480.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/93853285061.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/sukewigajanuvupawaluwis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=first+aid+level+1+training+manual+pdfPDF 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_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 17016 bytes
SHA-256: 5c6e845a9462db6a31818c4325aab1d0b31cb9b6554a3c97b9d18638f10f91a6
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 10916 bytes
SHA-256: 7d1d4e3c031373c927f2a9ccc3cc922861acb88a74fa44cafc7e3b3912624183
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1