Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42a262751e53bdf…

MALICIOUS

PDF

91.4 KB Created: 2021-08-27 06:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f84b3fba28531ea09988c3003c7e2cee SHA-1: d94bcb1b92c10bd23237e2c8fce6951a7048c408 SHA-256: b42a262751e53bdf474a418dbc914abb4c85594e18ece25b432668452515e828
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to exploit users with lures such as changing voicemail passwords.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oreoltour.ru/sites/default/files/file/60965205524.pdf In PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/6cc2b4c9459a7abc9d2f2f21f406e3b8/tizumefeboruvepuziramoge.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/52100522329.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b2dcd34ea4bbfb8005ba27d7531ffe3/5960829654.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/tofasojisilemuzogo.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/fajulore.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/jabopaginupifodowi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/be34a1f58fa42c58533a7e73ffa53056/85404783863.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/navemudedefeji.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9ab57e87d32ec5455d1bcde3339486ff/duvakatolul.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/77797055495.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/korigifajupu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16099c95134981---zogaguditanikogupaloji.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797ff1a3cf2---deseti.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608069af37f4a---sijixu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7f3bcbb5f762157fe9cf4113a36622eb/meliroj.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2ac03c81---vebuxuzu.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/37596904862.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/43260076329.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/895b742ee49c4d45cf41d4519669932c/26641914131.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/fukotexobodasope.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/89620427281.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/52965606988.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/46540155309.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffce8c388f1c1c844d822318a1e6a69d/17920265984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=change+voicemail+password+androidPDF 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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001171c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171C 11044 bytes
SHA-256: 1b1077a4a8ca3dd3fe18b55c4013cf1e82b02a1cf312a60b937f9cc6b97dbe08
font_02_sfnt_off00013075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13075 17908 bytes
SHA-256: 019da14907929029375c4e70d514a7e1cae1e6f0ac495f6306e125923537b191

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