Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53241c8e2b95fe…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 02:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b6d1881996aef660039fa3f312918aa0 SHA-1: c9e3d4bfd44f3116c95c299d30b2ca2febf9a7c2 SHA-256: 4c53241c8e2b95fe37185383e0010386537c015d69d25f249221db6e0841ff27
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious sites, consistent with phishing or malware distribution tactics.

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://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/nbm9en8jfn5eqnq1j1t566c36d/tezakizenofile.pdf In PDF document text
    • https://arhstroi.by/uploads/files/kiwazesubeti.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/43399208093.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/67637685688.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/pirufoxitanukawubuluzado.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210815212848.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/14d9vhos63a65b6enb4vqhndm7/18100857341.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6f42d2c8b9badb1a220ad8c27fd4acc2/lukepekobadukezore.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/tidowodeval.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/46861388815.pdfIn PDF document text
    • http://huntland.hu/upload/file/70761959596.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxipupifatune.pdfIn PDF document text
    • http://candientuvibra.com/images/file/rikogetozol.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/baxim.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e048fcbc117adeb97d7a13c5bc8bc7bd/71249284025.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/87d51d781f8f82acf2a7f99ec1cbf23c/42513268034.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/me1oopqhjbmht0pqqguj2lr3mt/85613081942.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16120dd91d3ef1---sefekobutosedepe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5a52b7ac3---12645359765.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/sapuwazukapuzu.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/61124062021.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108272034148731.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/51373944833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=french+medical+terms+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_off0000c7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 10740 bytes
SHA-256: 846c34a2e9de8192d03114253d829dbece9162232f91696b18a2d0c03398f9b3
font_02_sfnt_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 17524 bytes
SHA-256: 413e7541b4561d768407c37671ab465256ade17c82ab8d6b617abfdaab4d3952

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