Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89bf9466877c3a0…

MALICIOUS

PDF

91.9 KB Created: 2021-09-04 10:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b13e04b3e1aca6f83a8459bebcd90aa5 SHA-1: b5770d435f553cda7e9de9ad105f1926ac158752 SHA-256: e89bf9466877c3a0a8795f05bd8ef65834f854f5657fa8c9adc29fb4d0026660
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple URLs hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the detection of a link farm on disposable hosting indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f09d8b4844a---14022661074.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d7a5f10e7a19f4999977c790300b2a6b/37834351858.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ec10a3c16---wetepu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55ec3ee22d---kupibirex.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da5fc0ff21---9927751122.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/97mp2bqu8b6kgusl2b0pvvn27j/82458971866.pdfIn PDF document text
    • https://maclashoes.it/file/muwebifoduvukajakesigu.pdfIn PDF document text
    • http://lovesenergy.com/file/fewudamuxanoviromewif.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/2534999286.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/46a6b46a2aaea1bc74f5e5d406d48902/xazufagepixitukuruvopes.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8b528318c---85853838835.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/10491954440.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/pafemasifomuruw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1715e4af---gaxanel.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/3aece48a619bb0d453641bd5df77c2dc/xiresog.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/dedupulixewile.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/54vmvs0b4kgfihja1aq7r0kmi3/21647217799.pdfIn PDF document text
    • http://fastgood4cheap.com/clients/4890/File/gapudovulozuxonug.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/vigiluwapidaxunole.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/76d53431c948d5a5de080e24775a27da/lafet.pdfIn PDF document text
    • http://halaljones.com/uploads/files/83777288846.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7aa8bc6ad---65004589597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+legion+of+regrettable+supervillains+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_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 11048 bytes
SHA-256: 38e3376e9f07dad264bb654858951f3a40efd127a542bde4005a491e9413295b
font_01_sfnt_off00011973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 18444 bytes
SHA-256: 67e164901c52e19a46082a74307793eeedd5622afddb0b5a9f91cbe30cd58368

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