Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f1d4853f74da72…

MALICIOUS

PDF

104.1 KB Created: 2021-08-15 08:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4f6fdcf0367cfdd4e2627d7b5dd703cd SHA-1: 885df1b3363d3bc0a810fefe75f993d7d73f4bb4 SHA-256: c6f1d4853f74da7208f2bd12f39d404697e54b5c7cdd6be4e18cc4ab64bd56a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. 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 0.9983

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://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a785d2e8be0---gijoruwojizofetawu.pdf In PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/69ae8ca0b38cb2b49ff2bf2d1e8e940e/judijezabufepugala.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/1ut2trmih0ci10ge5e633enbum/giruwiwovapoju.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607778411dfef---vomotovekixusofuvodogosa.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/23758527350.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/42367999758.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd028ddbb---fatadaxidevu.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/tevid.pdfIn PDF document text
    • https://saporidelletnastore.it/file/vopenuwoke.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624765770.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/nekasesevive.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/e409eff1e898b4e69208ae57ddb47c7b/99569607451.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65906090914.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/37152762154.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0af93ca5b---jemusukur.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d14b29cfd3---30732496266.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/05f1d4e0e07e28aa9c99d0d908fec72a/vifalewa.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/13130780550.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c07f3b75c0f55b6ceabf0bc46dcef1ba/83569486791.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1aki6j1frqg1kf7eve99pa50t0/32940359545.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/zavadiwuzi.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/5988256943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+codominance+and+incomplete+dominance+are+different+from+other+mendelian+inheritancePDF 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_off00013239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13239 10796 bytes
SHA-256: 475730b74cdea7109a471169e0b3affba4194f721bff865dc04d19f34f62853c
font_01_sfnt_off00014acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACF 16672 bytes
SHA-256: 8325571b1a1f13decf6ca1f7d4ee23a3aba72b45380c344ca965dccb20e64f71
font_02_sfnt_off0001760a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1760A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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