Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d033cfbec6feb…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16ff76317c68d1ddb7d826b6885093a0 SHA-1: e99459e14e094bed24118a317ad9e8cf5ec191c4 SHA-256: 337d033cfbec6feb2762f5b331517c425ce7522c8808b9cb04c944d28107fd1c
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution point. The presence of numerous links to compromised WordPress sites and the ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161302e130679a---perunexirorirupaxojaka.pdf In PDF document text
    • http://turinimoti.com/assets/userfiles/file/gidinofimagatubo.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nibevupomorubolapiwujesa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c43b079a---43210662189.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/33680429861.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p8v4unlvqo47coofiojhdu4l95/44777926832.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/nulakowevikexivip.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/1888351427.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/24506523537.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/4100267941.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/5180914237.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/34695868428.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090318290633.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/96337f0e5266d200d84f4dac4a65337f/89900634510.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/102a425dd4b811d7abe1cdd69f2ca9da/29577873352.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/34350022932.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/sutapixivipod.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/beloxadatebiruforiwo.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/kaxowofenovenizufijinu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/93350236e504444b1332a3b6497485bf/welepewapuzagetixavugur.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/78117491355.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/36777652894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hevc+video+player+for+androidPDF 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_off0000cc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 10520 bytes
SHA-256: c731e7e0a83435c5e9975fe557121355e255601f9a3a92800f7403d5a493cda2
font_01_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 17924 bytes
SHA-256: 83dc657d8041043cba28a423ea1237dad49b054445b46250faf5c0fb753956fe

Open this report in the interactive analyzer, or submit your own file for analysis.