Malicious PDF — malware analysis report

Static analysis result for SHA-256 856caa85e35dd297…

MALICIOUS

PDF

86.3 KB Created: 2021-09-12 20:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19ee7e119f0096ed8ec11419d2faa056 SHA-1: 7dbe2b480fcb9008ff971b53b65f6bce31c9d1c9 SHA-256: 856caa85e35dd29742fa3279b40789c3ae471b300f4400bbfddc12842ad676e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://abwcoliseum.com/uploads/files/nuramerexonuzi.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/pks4rua2id8v2ve0hgosbjn9ij/jepogibaloxoxuzemigerose.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613651cac32d6---mezewel.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/86561097265.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83234708482.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/64608156408.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/furofadoraxuzal.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/14062190876.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210903120151.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/0cb254d3c7394561c47c0d2c0aee7022/4100546815.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/fusirevesoxotaxoromew.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/rewubenozidedezefuwu.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/40207901389.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210911152034.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/5490185571.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161319522449f9---tisadituxupuxupuzo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/59667582108.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/danoveranugitilosar.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/81586653677.pdfIn PDF document text
    • https://msiutilities.net/documents/giworidisizanomiduzisag.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/66753437652.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vojufunixukafufefiniguvup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=offline+english+to+spanish+translation+app+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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 17176 bytes
SHA-256: a0461466fc972a5d640f65f8e315a16713b1a94e88c57ea8038894dc6ee29213
font_02_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10800 bytes
SHA-256: f08f673f20b3d1ee4ff26fca7a09e22f089e0da61b048a4a3f8c6c1702caa401

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