Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19cea29ea73e371…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 07:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7a14b68673b3534531b57e6ffb0fd724 SHA-1: 0c8fa7b2f488ea1fc44f4c79050024315f62bcb4 SHA-256: b19cea29ea73e371c10fbbcf828dde4f42a8b5cf12e4fd122431b61377d58d74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cf640b52a---putev.pdf In PDF document text
    • https://takipbizde.com/calisma2/files/uploads/gunigutikopogunaxig.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/lerizu.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/gojurujubegozi.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/79241923856.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/wesexadasifivo.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/zinumutifesiwas.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ece6f7f2---61789802766.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/japotabowavug.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197230295b---6147792884.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4fa0e71c4---vemiwadafefibudozozanig.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c6ecc2c55---83555318125.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/tegageferi.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/22379976937.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1pg8b2j8lolk5f9tmf6kb6a6gm/nosegilejepeb.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/12886245957.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/2530206578.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4gn59c2tfpm2fvrfqorksbp5uv/75819980971.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/rujusu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jokojovonegexa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6da385355---sotas.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/70497686745.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/18921014454.pdfIn PDF document text
    • http://hopkinshigh1966.com/clients/1/10/1054c114374c88b4a165e91103565d41/File/80547072527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marriage+biodata+for+muslim+girl+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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 17608 bytes
SHA-256: a5f3096dd2e1a3c67b6b9497a6d5a840addd1d65e6fc6cf418a43613baed1efb
font_01_sfnt_off0000fa99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA99 10972 bytes
SHA-256: 7ba8b54665bab58b111a431485e9c46b8576c5fd594f10e6b4cbf5d9b63808a9
font_02_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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