Malicious PDF — malware analysis report

Static analysis result for SHA-256 d939ece4ab4cbe7b…

MALICIOUS

PDF

83.9 KB Created: 2021-07-18 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2da3d5f2ee9380876540557cb8735295 SHA-1: 98f05cf3232148d25f694bc65e89c981def16065 SHA-256: d939ece4ab4cbe7b546a983583945f3b1d6c93b50f4f0c6387745f0aedb874af
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites that host further PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://vivekanandbawwa.com/userfiles/file/gowubego.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7op8bp7euqspgmb49nclisu7n0/belid.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a1866cc7c841b29b7fd5e62f55f1cb6e/55310633908.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/nuviguvojifaritexamug.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/0muo70r59n95bvq9qehoqf30kl/sovusepu.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/42209005725.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/58942162826.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/94717024088.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62e7dea53---tujupebuzev.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbce49986ee6d54fff5967c7aa43c4ff/zifutikuxupijuzilamunilix.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3eab6809bcb4ee5b23896ec506ed9fb3/84275096809.pdfIn PDF document text
    • http://snsi.jp/image/news_file/bimofadi.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d62497a39---davemeresadizavuf.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/xaxixivewijuxajulipuva.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/sidodu.pdfIn PDF document text
    • http://sns.hu/_user/file/vivifimexezefasevemefeb.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/6d7c3a61b660e04afed2bacc6501039d/54171005436.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/67336581099.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/lozim.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b388479d8cd---terenafusulezesawizarugok.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/dakowiwedaronawulu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3ab2696d15---zaxijitibinogufeninadu.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/88687808278.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/40b28b9f2175a61df56ac251a047b9a5/3904794234.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/lotagaxodewukegesomep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=eyes+start+watering+for+no+reasonPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57e56208135ec1a7a7f4b74cc2a8ebe/1534205643.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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005B 10524 bytes
SHA-256: 8a1cf6e0a4851c8f2301c74e557731e055f421e66e82b625ab55a35637ce41c0
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 16048 bytes
SHA-256: c5fdaedb1047e60324cde36fa30b3ec8ea41822249f447bad11232aac39ff86a