Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a229d15e65cf86…

MALICIOUS

PDF

98.7 KB Created: 2021-07-27 18:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a26647bf756563c676ddf0432a8001c4 SHA-1: 64624c8c13a1149e350c73d0f4329841dd3a7382 SHA-256: c4a229d15e65cf868f6a4120cb854b52eee4500fd420494a05cabb5d1a191a3a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is designed to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kajariaadsevents.com/admin/uploads/file/pedotu.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/vafajidulirafus.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/21ijfs0iavi0ph6muic025tlq3/ritowipenola.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/zoderizukosanamudu.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/57137275716.pdfIn PDF document text
    • https://sapporopools.com/contents//files/momiz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2287f46d3afcef4556b4c2f6d548dc7c/27204651785.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/144f4a8790ee856cf919ef37af65cf6a/lanufavijosutelepaguravox.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/5559991552.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/gujemosesadu.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/c5ra6u4e1n4ludq2s1td4hbquc/zilepisuse.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f5f7e204c1679bc749e2e2f14415f72c/bubixonumusawave.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/zaworopejugijovu.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nilobojusukuluvafix.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455890ce1b---29111648475.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/xusimalugagilepovadobud.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c20c4ca6572541584424bb14bba69f81/24412728918.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3940fc09---12174733861.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/fkenr3jptgdqvbaq595t0t2n30/35550855711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55350c586---mawepamojowerexopome.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62a18c8a9---wuxapujedegidolegale.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/zufizakomatosaso.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/es1bmttghap4oo4k4co0oicr9a/digef.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/nabolobivukofarozizajukes.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/up8rj6ujs6l3sj7m9kllp0lkh3/dewurapomojikaromo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=prueba+psicologica+terman+merrilPDF 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_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 19396 bytes
SHA-256: 155f4cecc2cf07aaa0ad9218b295f4bc0d37603760a7fa4cb009dcc435ac9d1f
font_01_sfnt_off000149a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161BD 10960 bytes
SHA-256: 346bbdcd5a434c96160d64b255119fed65adbb0bd75ab039e99925830472a80f

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