Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c61d6b783bc9bc…

MALICIOUS

PDF

78.2 KB Created: 2021-09-07 10:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84065d79ff2ca738af934a662e4a81d5 SHA-1: 54f8157421a29e3ab969a9a7ea6562607316d897 SHA-256: d9c61d6b783bc9bcdcf96e308c0ded92b334ee8d443c80d44de5ac4d6bcacef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sanmuabancongty.vn/images/content/files/13280066274.pdf In PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2330d768d2---41149359935.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/gatizeforasobinubumexa.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/zasatunigomavumav.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/32912oupi94u6qfi7vdheqes67/37496472702.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/61778522450.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db0570c0683---12621493991.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/nulukom.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mjhhaqr8kj9787lh6adcqg23r6/sozakusajad.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/59511923394.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/nipuwuxa.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/vezagefovapewegodul.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/38570134911.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72706a3203---lalugedusozimebefatofefe.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/31972238174.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b038820bcf4---woredakosekadakoxojima.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/zobupap.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/luwonezagazexim.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5dff47ef1c---33546293625.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/nuxikiseniriji.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/vutokokododozenudejazito.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/60161156679.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/kigalezoloju.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/15816482495.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081e13ee4c2b---94312982527.pdfIn PDF document text
    • http://brlairport.com/images/file/18381773202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=rtd+pt100+3+wire+pdfPDF 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_off0000cf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF25 17076 bytes
SHA-256: f37ac85384a83f0d1d7dd05151a634c63733ca997ed0d7445b6a1cc2d695733e
font_01_sfnt_off0000fb50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 10368 bytes
SHA-256: 9e485cb276f02375015b7351e35bfa727168ad4269768242f24898d9fc3dddba

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