Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb74b1bd8799333…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 06:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1242af4d9591a54ec87a5fe9216f6fd1 SHA-1: af563e1831c258758f21a3c29258494c7fcb7468 SHA-256: ebb74b1bd879933319705f59387564316f71227933fcb31ca2c0584bd83738f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan 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 https://synerhu.ru/uplcv?utm_term=hungry+shark+hack+app PDF link annotation
    • http://noithatdangcap.vn/app/webroot/uploads/files/voramejarawi.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/ragenazorasuxunapibi.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/69474150004.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/93babc33159e4281e109965398f1250f/36291032175.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/rojivoserirazoguvugo.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-02-05-49-46-16.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/dixokub.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/fejisom.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/e5k1e60jo87bircfa1bh7ej560/14165446028.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/zadekorobojisusapudiw.pdfIn PDF document text
    • http://cke.hk/userfiles/95869937653.pdfIn PDF document text
    • http://learningkey.org/userfiles/38844494260.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/58242493646.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/16eb314ba4fa459f3c1287be13131971/21373119745.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/72700294782.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d499169b---54256786412.pdfIn PDF document text
    • https://edarky.net/data/file/detigelonidenuvalo.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/76026474134.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/17137612781.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/55006109256.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/12583520507.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/40131326868.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/86482073066.pdfIn PDF document text
    • http://synphabase.ch/upload/file/babikuditukogunelu.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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16956 bytes
SHA-256: 4494103f26caba13ec0165c46fd89cbb9be86e989a4ef82f3626b81db4df658e
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10464 bytes
SHA-256: 68a44c5fa6fafd2fc9e6b40eb1511acc054e59396a4f7a8013c0ff350610e24e

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