Malicious PDF — malware analysis report

Static analysis result for SHA-256 822b0306efc3ddaf…

MALICIOUS

PDF

78.8 KB Created: 2021-09-13 12:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0a73be4846bcd6eaf68f1fbbe9c416f7 SHA-1: 48e3faa424072881dc3239f49278d47f90144b9b SHA-256: 822b0306efc3ddaf065760b49bf235951eeb35d4b129c6aa7a97f5cc25dce711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1055.012 Process Injection

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://snuhonors.com/userfiles/file/kemexinuwekezotunevaguno.pdf In PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/23752583016.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210901063142_29g6yg.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/musuzanemunilorowivub.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/36355905139.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc282d445---diferemexozames.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jijafob.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vofopufed.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613276446f0b1---naturotenisotusa.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/19554621770.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/6606248858.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/40660693726.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/mojobetafigibasaguvet.pdfIn PDF document text
    • http://zae.me/datafiles/file/8402671684.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/monuzawozifizafeboguxu.pdfIn PDF document text
    • http://etkenkalip.com/files/39090576363.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/31414418554.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/3694737359.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/pejebam.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342c8af2499---14898142960.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/molevusenupivan.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/vibixanujaravoraferuwiv.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/9203917497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=avp+evolution+free+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_off0000d09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B2 10556 bytes
SHA-256: e0f032fb290684d79430f17a8dd816998f370c264002a908ba10f1ae918c70a3
font_02_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 17216 bytes
SHA-256: ac0313220e293fcba11ceea48c49bdfbb436d33f9f1170c520e52ff7fea1f2ac