Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82b06015515f6dd…

MALICIOUS

PDF

76.1 KB Created: 2021-09-08 06:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cf1618043c47dad0237a0ddd4fc7702 SHA-1: b0e326bd5c6bde2a94f129ee5dc369a9f9ab22e7 SHA-256: f82b06015515f6ddac50ec84f82f4062013065e38af8f767f20cb8d2992a028d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs that form a link farm, directing users to potentially compromised websites or disposable hosting, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=pdf+strength+and+conditioning+program+for+football PDF link annotation
    • http://lltsg.com/uploadfile/file///2021080523285949.pdfIn PDF document text
    • http://topas.lt/userfiles/file/92530536340.pdfIn PDF document text
    • https://led7.ru/file/sesirotekajenipuduzulow.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c60722327c61ae85531daf3454a1dc75/39457182569.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48d989cbaf---82839042920.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62b6153f9d---78370300292.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ea3dc633---41478486582.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/174046529460a98a104c5b5.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc9fd1e79---92288661438.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/db873ceb3c73babbec4f87224890d941/62834168010.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0mlqcch26c08lvddpv6mp9i3h4/76821722503.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sokawemumubafi.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/10685409705.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/saxofekuboduvojixulu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/ridezerorenoferiwuxesug.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/b8d59704c0703100d32e5c476cbdf619/19245191478.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/ninovanizajajosufu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210627220721_kp39xk.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/gopawisuduluwuj.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/97768786979.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_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 11208 bytes
SHA-256: 17f1359566e1338e9befca75eae041f8f965abc966e2d17a637849f347bdab60
font_01_sfnt_off0000df76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF76 16856 bytes
SHA-256: f0c20397694480773b59ae59df0071798a3112faff0733a515a037525e3a4057
font_02_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1