Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ac3ed44d58038d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 12:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 64a20c6cfd9c7e5f2c147d73acdd0978 SHA-1: 4d73d11deab3d65b8ac5def83b53c1e8acb049dd SHA-256: 09ac3ed44d58038de78cca16e3b72627c5bb669451bab2518853ca377e13e931
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URLs suggest the document is designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://canoeing.by/pics/files/jebofarifivaxejefowuzi.pdf In PDF document text
    • https://mbbs.hr/files/38816974216.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/56222092463.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f5b506e2b2655464d1415224718cfdf9/dafakixodivivu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a71fb46614011951a6565ffd48563ef/zesawetawunebuxoje.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/40d953cd9e845097814738b9c252f7fd/romekibonupe.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-7/20210807142502109897.pdfIn PDF document text
    • http://poliinc.com/upload/files/vevok.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/45605935921.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/c26345d627da5a7ac21707f9f6947342/19884696143.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/70145007699.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/zimugonuxefanowikakevu.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vudaxaxaronesani.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/0583a4fd039af25b4cccc6261374a056/20472409837.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/jidurukibejovotu.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/73491528115.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/firijezibaxowono.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/suxutem.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/67651453835.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/dukugukomepolejulinabopox.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/45301231906.pdfIn PDF document text
    • http://elskenecologie.nl/files/79926497003.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/mexibatasajobegomoxo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jbqo2gob23a9i7tr06457rvt8f/kufuwegupod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=accelerated+shelf+life+testing+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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 15380 bytes
SHA-256: 9e93e268753e4b2616bc8da21824e9e925e588a78f159c6e1db6ac174cd4473a
font_01_sfnt_off0000e47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47D 10760 bytes
SHA-256: 234579fbdcc02e20b9e108bcbf121979297c4e32b5a23f27bf5391835f11066c
font_02_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1