Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62440ee5acd0f4c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 15:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b505af1f4482559a500aa9c1b4fc7afa SHA-1: a464ced88ef139fc6a7a59dce7f01355a0365681 SHA-256: c62440ee5acd0f4c3d5e7b3c2de4c08139a4b1ae7432baf2c06800e88e0d8e75
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=calendario+serie+a+18+19+pdf+download PDF link annotation
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/7da2b2da75e09d3e19cd9b85668b2df4/17973972483.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/nivukenenagojelivabek.pdfIn PDF document text
    • http://rltclassof1970.com/clients/8/8f/8ff9f19c840b982a6efda18ba8bb483c/File/40622268356.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/522eedccdc53a8d4e99147a2849d13b3/69511974210.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d287fd3a9fa---27262388851.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/75276819337.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bc115da7---82688445727.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/71ed460d70444940e2240fc4598c4c11/vugoberamutakelaxuxe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161124c0726802---17776596325.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2fb90971e5eedc2f2c6595be5fdb25f4/70839078069.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/totusepowalurazupexo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab6fa14f2f---davuwolokabepiwetojuv.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcb7fhksnpf05j6jlusnk4t411/88884895159.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0ebdb755289694436fce9a9831b9af25/mezuvavadamutawow.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/latuxidiba.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/lefimazukawufubip.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kupotufowarimewu.pdfIn PDF document text
    • http://artside.org/data/temp/file/73390445928.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5003771078.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/7afbec7ede67e80b958a4f9db7fa82d2/rilemivasuriwupasesikaj.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wamamozu.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/liduses.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/b638096d7041c2946e145c37d2620d01/48906949852.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/27766543783.pdfIn PDF document text
    • http://proxima-design.cz/files/file/zifiner.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_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 17232 bytes
SHA-256: 5ab5e5829ec52290a8f8fd873cdd56bcd8316c1a6339fa263016bd3efbf2188f
font_01_sfnt_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 10940 bytes
SHA-256: 5a8bfd5241fce479b01c7e4539e77c258040612dc45aaf2c07e4038d835527fe
font_02_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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