Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3870774bf95cb6b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-14 00:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0aed7788f29e1ba55c52f6d6a158dd4e SHA-1: 8f75796fa9fc028c3f5d32d6e6b0116acb9f06aa SHA-256: c3870774bf95cb6bf39b503e8bd48830093a9d49af5c1182fba6bb4ae50b09fb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/90982397142.pdf In PDF document text
    • http://puntolinea.org/userfiles/files/fufovizujuruderekunif.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tadewilomotuxorulifa.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bafasubizuwane.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380b9098a88---jamugididiwekuzaxome.pdfIn PDF document text
    • https://protrialse.eu/files/files/samimegogigux.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657174f81e---gajuzolazonibef.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/35ad30b151ab60908d86f1128bf6148b/sefilub.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/bifasegexufotimamilokozu.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/98756023725.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/mupovaladewego.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/92300028572.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/59357095702.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/witasofapezuxokasiwejak.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/polibubevotewo.pdfIn PDF document text
    • https://dacola.com/upload/files/96732175889.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/forosut.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/66b417f40fad7f1b1df7abdb59e80ffc/vikarezunapenabowomu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa599395c---ravaposonu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/lezax.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/60997228872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+rtsp+player+libraryPDF 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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 16844 bytes
SHA-256: 1e24ab99d3c62ce3cc7fb9f8f3ff6efbd69d211a9154ede3b937296ba75f8053
font_01_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 10620 bytes
SHA-256: 81fb5a6e788476c11a213b576e34e9b4f83a674301448383d17274e0d1cd744f

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