Malicious PDF — malware analysis report

Static analysis result for SHA-256 6759ce28c39869b0…

MALICIOUS

PDF

90.4 KB Created: 2021-07-05 15:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4236e809a60923c11efd3c436c80d40d SHA-1: 3600581d949d5bb7c56a11c35e1951b537ef0470 SHA-256: 6759ce28c39869b051f7cae0545fc74c2cfae0718dd625acdf5d32e6356abcb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=types+of+stomach+infections PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/a68457771300dbd0f5ad86c5d6da343b/tugojamalapuwirame.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6daa99f94472cfb54c2d76898164a06a/tekolexef.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c482557619f---95846319524.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/63323631979.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/65337486428.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/c14036b168b2fbf74333c04ef1a72ae6/95054454443.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/7q8jhun4r544lkmkcmjqv1jpnl/gotunos.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8a09d9b4---sujubu.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/4621041952.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/jejomikopu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3qalnbron7jtfd37mu34ituqs4/neludobupuvaxusan.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed7fad06ba1c8d7b5e778d5687dcacc4/75298368304.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/40d6df92fdff2d109029519d9dfac593/19035801079.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/88281413026.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/34826242848.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/22eb9302a17cadb6ad017850545c272b/93747356160.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/sjg98vijpploj8dsfj1o0p73t8/nezomepusaluwogirugeza.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140ca59667---keladukubimuxazimej.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/56afc7b30ea6692c154ef17cb029abfd/13323175040.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/ecd0a08380f64224138e675c3afcf695/22119557320.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/gofavefubabowikov.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e23e4653---4828232228.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/xepajonazumos.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/45925d2de00468311873d20468e88d2f/56150883047.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_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 16468 bytes
SHA-256: f8d6c585406dc1b379369216ef85794e46472fa9a2edd17c23cc81e582e3f0f7
font_01_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 10676 bytes
SHA-256: 8fbf724e46033078a8d7929f6abaf2bc31a43b40ab8ffde0c185f1514f923f24

Open this report in the interactive analyzer, or submit your own file for analysis.