Malicious PDF — malware analysis report

Static analysis result for SHA-256 c993d39a83ea950f…

MALICIOUS

PDF

81.5 KB Created: 2021-07-04 17:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5e29261b10669d5b45ce73cdd41e7dee SHA-1: 75c1beb844695a7a4289bcdf070f229f4b70dd33 SHA-256: c993d39a83ea950f671fe09ca13490a7a179fd6271d27d11cb03f4f45daaaffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=lust+tamil+meaning PDF link annotation
    • http://firegallery.ru/img/upload/87720708136.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/25393696117.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e0dad59d0d39e2f9f3279fa28fe0d2a7/58108705438.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/34805709748.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8275eb0b29---pixiwapojex.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/339442c54b66b40e574b636e3bd3064c/11669919317.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a070d364d2e---57890873496.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/koginige.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/tojamaratogowifegagupum.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/rezavifixabobe.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6481p6976lq8hrmihvchssbe8c/90639408106.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0klhka9opcdndsdikhsd5lb971/73747387007.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/920135035d879734c1c55ceb8f7b7e3a/filota.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/23342073749.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/19567828903.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vavugunuragosa.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4feaa0a2c2---tejil.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/97625250985.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/03c9f7d87768e141e4a82e8a9d28b634/15316904388.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210628/210628014319749808xf1dup8xb1gx.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/91175005867.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/18181914310.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072d5cc542fb---nexobinuturojimipe.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/caf6f4c95ba2147ccde7577a2ee50ce6/wovanuxidapo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hf9651ovh70t2dkmju48gdn6ok/44674373909.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_off0000dcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 17132 bytes
SHA-256: 7bdbee73c1d62aecd097435bf81162611e004afb61b4daea01cb651efb13ef4f
font_01_sfnt_off00010984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 10288 bytes
SHA-256: a54b7d2d6f61114ead8abdb76138150c0a3987e7dd138612ff1ba1e4f092d131
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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