Malicious PDF — malware analysis report

Static analysis result for SHA-256 2263c9c2260046ab…

MALICIOUS

PDF

88.1 KB Created: 2021-06-26 13:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a5eea5d12ad97c6fc9ad44df3cf293 SHA-1: 5af7fba05769e8040499dafcf159f57bfa85c9ae SHA-256: 2263c9c2260046ab36a707c4452671bb4a79586599b3e6681ae9b8b669464498
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to other PDF files. This suggests a phishing or malware distribution campaign, where users are directed to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/fd83dd051d39feaf12660e8666a4fe9e/fukezutukom.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1002ab4dc---85896584207.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9eee3bf0b8832942808aeced2a3afcfc/2239132738.pdf
    • http://uptownchantilly.com/uploads/files/fasakipatiduv.pdf
    • http://abwmarlboropike.com/uploads/files/59383772315.pdf
    • https://bbpartner.cz/userfiles/file/tigubab.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607784354e864---19944809534.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed39bd9aa5---76484015590.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4fd6c7c9323317b47ab72cfafded58b2/84147991788.pdf
    • https://alakharia.com/public_html/userfiles/file/wokurosifefitopa.pdf
    • http://www.awakohchang.com/image/upload/File/0618106519.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160780e956a6fb---89597012445.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed8a5a891---pixejusir.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab649877bf9---romulelasosozafilojak.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084983c13d85---93604766067.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/kewuxikuro.pdf
    • http://supermarketdv.ru/files/file/venisufabomejikinifiboj.pdf
    • http://abwplazaview.com/uploads/files/nuvazilena.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fad9a0830---15409544901.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/23eadfbb7104c1967842895584b51212/kilorupezo.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5020885d6---14356948058.pdf
    • https://prastosten.se/anvandarbilder/95/files/lepim.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4f268c874c4a8a35072ad1b7b9519b8e/xadanafijika.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/77f161a59bad8ebf0df10497bdab4e3e/nenaxibatiredinobomiw.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qe3qqs7kiapoobmpemcakj1153/jopedejanasimar.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e239a9f67---jivuruzilazudijira.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fa7947e8---10658175627.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=3+elements+of+periodic+table
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeda.bin
266ae5e38fb7a5e16fd14dac2d624f22f48ada279bef04c2b8a2b5ff333e4881		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 19612 bytes
font_01_sfnt_off00012157.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 16792 bytes
font_02_sfnt_off0001396e.bin
74bd95505acbe904542d13937d23a8f35cfb34bc21d083751f67d37c4cb03b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396E 10996 bytes

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