Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9daaceeff0ad45…

MALICIOUS

PDF

71.5 KB Created: 2021-09-27 06:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a93dceeafc9a327a6b8c2a960d2f7b35 SHA-1: 83ed37ec89b72f4311e58939cfaa8f624d184a2b SHA-256: 1f9daaceeff0ad4567d9d3bd4a44fed3a561f66781e4fb24e948f98a36b35fbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=can+i+use+my+phone+as+a+keyboard+for+my+pc PDF link annotation
    • http://agendatourvietnam.com/hinhanh/file/zutiwefijibedefefovadada.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/gatavuxel.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mi7lra7826qj5a0vpipc0rkskf/fuvuludikaf.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/77664412252.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/4863737176.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/86349157126.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/sefivalurelibogaza.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nevonomorepoke.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///3118004574.pdfIn PDF document text
    • http://webursitet.org/Files/file/jexubasideliriwowixoji.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/wigevowofe.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/21891148579.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161509c146033f---35959600388.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/79041672526.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f6587b179634971abfa292f9ae40b59f/51851153229.pdfIn PDF document text
    • https://heyratacademy.ir/file/pexosi.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/lasezanimegejatena.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/41487921609.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aa75c9df3---26838454258.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/28315008232.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/5374909013.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090210211837.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/31193345972.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/tukibupe.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/sagizodusopuforenibub.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_off0000b3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E9 15740 bytes
SHA-256: 32cae58bf29a19eed3e296e85a7eb87db9d124ee623e8425ffe8df68fec695b3
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 11220 bytes
SHA-256: f6bd5c522b7cba91b6869391076f9cbf578d8cef3180a2711bdf801b0f937903
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1