Malicious PDF — malware analysis report

Static analysis result for SHA-256 507e122ecb7397ea…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 19:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 763116b1a1b3abdf6dce47e0db3ffdde SHA-1: fd323050ea82fbaaef5ba2a1b3cb2e38ce83d36f SHA-256: 507e122ecb7397ea4f3123923521b61bf8be62830745ed151e6478c35b0bc3b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics points towards an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://awkontrakt.pl/ckfinder/userfiles/files/fozed.pdf In PDF document text
    • http://shmgec.com/Uploadfiles/files/16363744834.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/suwuwubukitijam.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/kufafevasidadepikozofo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/jopegijofajezejekofuni.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kanatilid.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ca5c5d7abb---19689253175.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/faroduge.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a79172ee8---30818896441.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/zowifowesoki.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609f169a0e98e---vokasezasowonovaniverin.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303fabdd39---bodowikofu.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88198579446.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/renam.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/27948070562.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/53107500721.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/65352844687.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/38394632308.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d0c4a600c---wowil.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/19704828838.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00bebdf97---77770876632.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109011003555581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lector+de+pdf+liviano+windowsPDF 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_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 10724 bytes
SHA-256: 617345464e8de9951e2b311e5415022a626b0cb6b2150d13c94404815d338958
font_01_sfnt_off00010094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10094 17548 bytes
SHA-256: d148f77da7c2bf29a0365e00e1baeef1db0b172efad30aae0e2f94da984307d7
font_02_sfnt_off00012dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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