Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4caf1b3c9f8b81f…

MALICIOUS

PDF

74.2 KB Created: 2021-09-04 16:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6c2e0e31e0f4e42d6405998130b2b54 SHA-1: 6c50d501f91666c3d4f56770f648b6020e74ee95 SHA-256: b4caf1b3c9f8b81f5b46c87120ca4446e8145d129c2f604985a7d8e19002f652
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://geya99.com/ckfinder/userfiles/files/gemagasironow.pdf In PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/caj2471v61ppm9mapvlpaks690/54599637224.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/91200472647.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/37064769093.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610402559b8b0---95138621971.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/67284958862.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977adc7e09a---14243155985.pdfIn PDF document text
    • https://cochleartudaskozpont.hufiles/xabivexokefutoje.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16128bd9058a52---13702636200.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/jitisakagirixojukotebolu.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/rozolufaguwewirit.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/dusurifigabuxuruv.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c478db1d822---70425281701.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7e046cc0---pusogetebixuzenokexi.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/televeniv.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/konileberipomofegexisu.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/98647297766.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/fbbf3e05437d2d6025733541383d0672/dafiwotebe.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/31a1627caf7b19f5c1771d9199da18f2/lirutuwoje.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/kivosozereloko.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/30603610511.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/3799803307.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=livro+trading+esportivo+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_off0000becd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECD 10652 bytes
SHA-256: 971aa28ba6013af8f86654296889a1bacb7ac18e4c7e9dfce126e9ba655deb4e
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16800 bytes
SHA-256: fd4ae3f86983a59d8c311b8cc7bf236e93dca01e394c63cee6f061e3e90b504f
font_02_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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