Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43a52c24a019eef…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 10:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2903349b475cb37b45a98eeec70df288 SHA-1: ea8e12569b77c85dce2ac162d3d81c1eaaa4357b SHA-256: d43a52c24a019eef5a8a9c5390d0a6f7f67c9919fa672696ec0cd9bd212b334b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to external, potentially malicious content, rather than displaying meaningful document content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8301e8dbf6---46790102387.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075929f6b30a.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/dewerizubuvuxozit.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/573488e54d1d6c7c6da720e2fa2a75d6/18062089864.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/rawojujogixebajupanu.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/balabow.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428de92ed2---girojamenonizejogijadaduj.pdfIn PDF document text
    • https://capecoralliving.com/media/file/xanixefex.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zubalafipad.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70a3287633---kopigumirilewila.pdfIn PDF document text
    • https://drsaman.com/files/29404066844.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gonukanumurojusamova.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c722da3585f---xesirimapipupetuwira.pdfIn PDF document text
    • https://triosms.com/userfiles/file/manuveje.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/jenawijakopal.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daxotoraxuxako.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/wefarokumarudigumemoxo.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0aa6b81b359a48e469619bc466393c62/xusokafanijinoje.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/fo142l1ksfq4lbkauskjco5k81/49734059131.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gl53hj5bl72qsv6vt726jf3vct/tivalapiwa.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077429fa35cd---25091233443.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1627953479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=division+properties+of+exponents+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_off0000bd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 10452 bytes
SHA-256: cbbb07f6a3cd97e0f57bddc39075264f6332a9bf8b85086b7d6c1b927c8e1a7d
font_02_sfnt_off0000ed80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED80 16568 bytes
SHA-256: 7717aef759ab68b6b4c94fd32915c5f665b5699b4d95f170e5fb7f5ea21299dd

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