Malicious PDF — malware analysis report

Static analysis result for SHA-256 551124415c01ad54…

MALICIOUS

PDF

94.0 KB Created: 2021-09-06 21:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3925632c0757b17140537b0923b9c2a1 SHA-1: 5d380836ad24fdc1f23aca53615ac8a54355a6ad SHA-256: 551124415c01ad545ff0388040155728b59e412ae0aeca89a5f39dd15d7f5835
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which host other PDF files. This suggests a link farm designed to obscure the ultimate malicious destination or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://saigonford3s.com/uploads/2021-08-22/images/files/giriputuzabifadorajijanu.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/25dec4f57b638a542657bd9b75169381/94950060860.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d0bc7822ddec70be34b36cff496d70e1/2310732091.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/20643354161.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/49753972238.pdfIn PDF document text
    • https://isosklo.cz/uploads/63377063614.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/rs34rdurgtuverf3g1mcpi60u5/51570048419.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/boxidonexiturufeji.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100940df04d6---nedotifesadelanifunatuvo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/54140160771.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/wepetupamelufifipuzafojaz.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16088c71d7a9f6---18069846287.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac3313e77---81211079258.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078140fd0a08---bokigosopatilatogorap.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6933344857cdd1ce6b440d2e242cdc7/fawarizur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/20113010300.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/zufefomulidana.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/83609238845.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sabelebugoxuj.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/68424179890.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084846e3cfb0---85297941981.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/27899338196.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/49012849311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=transformer+un+pdf+en+jpgePDF 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_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 21028 bytes
SHA-256: f4a9823cbadc8801e888bf0b54555b5d296790a13b539ff8a581f2e5b22a3830
font_02_sfnt_off000151c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C3 10800 bytes
SHA-256: 92634fb7829896e27937359948309e9d11e71604d2ad9473177c7802d7236eb6

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