Malicious PDF — malware analysis report

Static analysis result for SHA-256 4473d01924f111ec…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 19:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df488e00c8b5e6d6ec5e37a37de3c2f7 SHA-1: 283f8e39190e515bc2eabb916e5b4af4d21ce758 SHA-256: 4473d01924f111eced92c7797845c68846ba7fc7d42ec4b6f89f94682a3b65cc
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple URLs hosted on compromised CMS platforms, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/severupaxe.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/0549296e3426584518177e81ec2aa18a/wusegizedemefage.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_013044.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4c3dbb7ddb724354ab8dc3f4fb1f4e61/5548889286.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/57693371047.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0b921e48---reroserimumuwilaganevuxo.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6c71223a1745892694caac5b64c27ed3/fozunepoxaradet.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/jpno8rc4qd71a64qgspdnc3v8m/buliwuzukukireg.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/47bc34917d70f1cfb117b88e82641118/34333634094.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160739c15401dd---fezelutuworewosu.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dfac97711---51319719568.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/vesuxowuburenizilakurulop.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/fuvufusibarepegawutedorad.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/cfrg87usei4sm0f74heeg9mel6/4581999242.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/29393176576.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mapototeb.pdfIn PDF document text
    • https://visualarchive.bg/files/xesipegixo.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/96904263134.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6aaceb210e61216f1925eb9693a08901/54285866660.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160782e56d9a00---ninofovusumojivoku.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608f8692a4985---25273767795.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/66676352527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bichon+frise+and+havanesePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c108c721b81---kemutigizowesazojo.pdfIn PDF document text
    • 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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 17648 bytes
SHA-256: 2410ea6ec38b0e275cfa20bd6a89c8a3eea300655393e6d319ab083c277a9cba
font_01_sfnt_off00013496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13496 10548 bytes
SHA-256: f48c377315f497227f709d3c9336e784db8a8a6d4cc3317b34afe3f77fec27e8
font_02_sfnt_off00014c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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