Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd89a57ea5c00a8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-18 10:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b62db4e64cb35e9b288823d3e609dd3 SHA-1: 911c4db9cf953ae532dc81bdab2e8e4990863d8e SHA-256: 3fd89a57ea5c00a85f13763abc417aad327d08352281bc2b7dca47cc61734a65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or SEO poisoning to drive traffic to malicious sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://synerhu.ru/uplcv?utm_term=how+to+change+android+mac+address PDF link annotation
    • http://om-ar.com/userfiles/file/famibot.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/98847079178.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/zigetuvana.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/nabiravedira.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614533fa1f984---20849412956.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/57016945958.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7ca2cce2c---tuzotijuseke.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/tadifulogujevaxudagex.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090319483673499.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9b116b4269674ae92b425b7b7fe8f8e4/107167687.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gepuxamowurilipexiris.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/85771835400.pdfIn PDF document text
    • https://rintrans.com/files/6060780990.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0405b0d---76917155681.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161416791b92b8---mamewoxuvimezomapav.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/54ffe67933f87a6bfd299385559aac7c/rebiketumakexuwejago.pdfIn PDF document text
    • http://riph.pl/userfiles/file/gipodoba.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/nituwivivikif.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/2858247650.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-18/20210918152134280018.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/30626480235.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/raninisu.pdfIn PDF document text
    • http://homeopathyhk.com/files/leboravojuk.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/21506693262.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kekax.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_off0000bd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD18 15344 bytes
SHA-256: 357a05d0a0aa690f17f09e9a1b77e28d8285d0e8465baedbb654e6eb1d287df5
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 10848 bytes
SHA-256: fa57bdb0d7eb31a7f8c3facfbac7d1ffac66f48db5f4b87b9d4e9d70a83399c1

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