Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b09ccd6ff312e2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 11:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: adb0cc78626667b4af2bec61f5cafd19 SHA-1: 497e0a6fb8f1f0559a856418c92be62ee01a9702 SHA-256: 82b09ccd6ff312e2c4da2fb0d7a4980e89f4d6a1fcef57156f5b767120ad6b6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=java+rethrow+exception+with+message PDF link annotation
    • http://np-laser.com/upload_fck/file/2021-9-14/20210914143755290219.pdfIn PDF document text
    • http://bazoolwddd.specialty-match.com/upload/files/2831245941.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/pevuduzebukopeg.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/71069275528.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/29799364444.pdfIn PDF document text
    • https://reha.bg/content/upload/file/kiriwipodavadew.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae134ef111---fomiviveramogofa.pdfIn PDF document text
    • http://sksound.com/userfiles/file/fesule.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/41277336759.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-23/20210923022124149297.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/86854643655.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/34069477288.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/35076457708.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614305dcde8d0---34149610329.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/31612843727.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156228b12faa---67356373475.pdfIn PDF document text
    • http://minipit.com/data/files/65111559215.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/luvodajuw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jopabala.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/uah9rqgo68ogdoi2n1l1ne001c/36999833408.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/kewugozivaguvofut.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/29118892572.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/93389907406.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_off0000b12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12C 11020 bytes
SHA-256: 0e7229a33a8180f34d9d0e77f2b61836a79d3d41dcdaf7acaddf45740807e455
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 16064 bytes
SHA-256: 2cc2b352197cca2299b1ba94eb270f8b8421666e1d32f38f8a3deae62f0031b4
font_02_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1