Malicious PDF — malware analysis report

Static analysis result for SHA-256 52faa9744b484355…

MALICIOUS

PDF

91.9 KB Created: 2021-06-29 12:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2fc3816a38893f514389391bb7159c08 SHA-1: 70ce0f8b4fa6eaa4f45c931b6ade53e1c5530434 SHA-256: 52faa9744b484355f136f6f4791bdf3b20df4c7c7f4342347b5d3c4f299f9fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=fuzzy+logic+with+engineering+applications+third+edition+solution+manual+pdf PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160977853f369a---9426082400.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da250d4c99---rekajezak.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee2bb4bbf3---6533471359.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/wexiwetupewofaxomigi.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/gorajawer.pdfIn PDF document text
    • http://littlefreddieking.com/clients/65037/File/81833773099.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/67644413107.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/99465423016.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d703dee7eee77dfc2f9a7e10295076dd/64323991027.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c2541887---naxifelekos.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/eb3a7e3da7bcf028948da0fb1eb182bf/fovoru.pdfIn PDF document text
    • https://beaszemin.com/files/leragupopevanibimox.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac3dd1148---pomobaninosisifetofuja.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/bidomon.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/nelovudodotupusupo.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/92927777246.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e56aa3d8e---devokigaguxude.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/97045089327.pdfIn PDF document text
    • https://elektrona.cz/files/file/14515988043.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/15625943511.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/69316527414.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/vajilatekufuvobegoj.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/siluboburije.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c46420f6---sogefopefe.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f087029a035bdedc4f9e863c150f124/97003980997.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_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BB 17612 bytes
SHA-256: 15098e69b7b66fb15d5ecc578803e54a8a38595787d6e749bacd0927d4782775
font_02_sfnt_off000146a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A4 11404 bytes
SHA-256: 2ef5737879b44d2aa7077f793915eccded8ce68c32b3b55be192f28029b4ee0d

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