Malicious PDF — malware analysis report

Static analysis result for SHA-256 d829acf0a396104c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 05:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9587e8031cef8247ff9428eb665e9c1 SHA-1: f06566b4c8f8b980aacc1ce36afdc96cb3149ba1 SHA-256: d829acf0a396104cce92a5e5e6f84b44e651766d28df2e0bafe9bbeac08013e7
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. The PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cyklo-sport-servis.cz/UserFiles/File/80358187145.pdf In PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd99b9340---nodogimim.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lofidapid.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/87824671671.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/dugonopinune.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/aebad9b18bc306cefa18483f4c928b1f/dusunagufupevarosari.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf3d83c333---lovup.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/magupa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b744e66f4bb---97062660513.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5480811d18d1d9f60d503b598eea49a5/jurirafisifogewuzofu.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/74971697922.pdfIn PDF document text
    • http://islandpointfl.com/userimages/70612761146.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/31892980635.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084a957df7b9---tipusuxexoxiwusalegipe.pdfIn PDF document text
    • http://webs123.com/userfiles/file/30279633531.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/5389447259.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdfca5c0c---paraxame.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/64049d2ad5bbac791dc392e3dbe89cf4/55855320057.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vuwakat.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b17f15d3---54124061536.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e07f144dc42---64919435152.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/jaralosodawubekaf.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/10834079213.pdfIn PDF document text
    • http://poiskvod.ru/images/file/41820210858.pdfIn PDF document text
    • http://gewald.ru/content/Files/kusupozolawinivevuropotiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=urticaria+cr%C3%B3nica+espont%C3%A1nea+pdfPDF 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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10892 bytes
SHA-256: 4591767a34bd96f2fbd1927bc61eb003990e142d58bcb6c0c01d784b4190fda0
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 18828 bytes
SHA-256: bdee0a45ef017dd0d36669d5de8c59d66e7c018db13e55ec8d4c2babfef7c7ad

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