Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a7ad88bd79f7a0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 21:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 390626f2804673d2ab62d2549ebc6375 SHA-1: 58aafb9b55af9e7dfa708fc60cce9e48aa0a5081 SHA-256: f3a7ad88bd79f7a049e325952e87bff5ea982bd541fe0ae20e5bc91e8e5c0336
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=jaago+tamil+movie+2021 PDF link annotation
    • http://hp-cnc.de/uploads/files/punivolavoz.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/44762397932.pdfIn PDF document text
    • http://belv.ru/userfiles/file/sojojoxiwipawexefolenoju.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/39204783983.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/58667809943.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/81242554601.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/latefedurerulison.pdfIn PDF document text
    • http://makaroma.fr/upload/file/beremakanik.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/50430662315.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kikuxelomalawobelomup.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/66955348500.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/waguf.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/95215457818.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eub1vbbati1uj38i5pqvqnf2b5/80806826338.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/totokagobavapulumezeza.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/88825576530.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/kidikumedujepej.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613057a41255f---50110003512.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nozifakikip.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/genivomofupekivujudenan.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/65299022109.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/zotivalovozojovepepaj.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/21481403370.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79bd14025---zukadiwawunamuwuxojofuf.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_off0000dc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6C 18428 bytes
SHA-256: 033e984fd774a77e925bc395b34798e0d4939870218da15f3c7d4f9947118261
font_01_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 10428 bytes
SHA-256: ec58f63d1af45d06ea81e0191cce9b0695d3dd28531a3377b83fe47a0371366a
font_02_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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