Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4f0e10301f1d05…

MALICIOUS

PDF

72.6 KB Created: 2021-09-04 21:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 939845d4cb3ce8b4011432e8ab5a4b1d SHA-1: 3cf079007a124c7319b3217d933de46816dd6124 SHA-256: 8a4f0e10301f1d05c57e521f2036d26097e885a49bba72c9037173d28c5423de
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=groovy+language+tutorial+pdf PDF link annotation
    • https://travelone.ae/userfiles/files/xegononuxerufaruverinuset.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/01uh41ij9v4v8hq4l6sd0mc4qc/5972680240.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/genukuvidebodusukesag.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/gojabuvubobuwomokuxir.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756efef6a5---18827397996.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/nobiterujidaxitiwixu.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/1c867441c00dae2cb4969b53deffb9be/tokulipaxonukesonogeka.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf9847ebf---sinapagavojarafal.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a47c90482a4d1d985c36998e4bda2acf/34436644022.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/ragukuj.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/pujipek.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeb362ba8---43783919066.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/guzofokufeb.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wedax.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d153e7f24---52047077766.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/55996206704.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/fonusaxajetugid.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c35ae1a79ff8958fcb58b9757df4ec6e/83483497651.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/62025804493.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb638c7471---xezuz.pdfIn PDF document text
    • http://myqself.com/upload/files/wojugunozozewena.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0cdf214bd475fe221c0e22357b25b4ad/mubamed.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_off0000ba3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 16416 bytes
SHA-256: c46d03a653d84d06e32421a5854d4ac438c75b0e06b73addb0addb6c8958b5e8
font_02_sfnt_off0000fc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4A 10824 bytes
SHA-256: 340bbca3c238772c0b94232cab9c2a3414c02bb5cec246bb4dc4278931ea08c8

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