Malicious PDF — malware analysis report

Static analysis result for SHA-256 d463c736192e61b4…

MALICIOUS

PDF

92.2 KB Created: 2021-08-07 00:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d0664041674c4c264fd2d4747fb96192 SHA-1: 9b72f369d8b60025af7bfc9c1b16b041cd8fa249 SHA-256: d463c736192e61b4f83674083d064ee65338ca3bfe6ec988c102e35896ddab27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs strongly indicate an attempt to lead users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=ap+style+on+play+titles PDF link annotation
    • http://abwingssuffolk1.com/uploads/files/xumopusubezatofenasofizox.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6e0640170bd01c0a140ff98b36040da/fivufagujeferumidudakeno.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/xavalixuriwotujavusije.pdfIn PDF document text
    • https://phr4u.com/files/xarekoxel.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/90111075058.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d26758559f7703eaec1035eb4f8d2504/85681926476.pdfIn PDF document text
    • http://fittbikese.hu/files/file/diserexeluxuralajitojozo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bd891c74aa9dba414acee94ea68d2f2b/82575497977.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kuminobetewejofezode.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af57aad2ba7---87549415928.pdfIn PDF document text
    • http://beachhigh65.com/clients/879402/File/7736819980.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/dff2cf38856cf9e45c004ff1a8dac3e1/12577841295.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ss2768ffsqknhverjnuij3uhap/58587952589.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8792f4985831325b5d595b6d7ca760b6/fipudasenegaguvolunejija.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/15478364175.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9889e3a8---26086106117.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202106080702499505.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/58062079027.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/duwomiwesaxom.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160b5ae9c4b0f9---pewafakexajilure.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a53c2f065---kitifikarikowaf.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea1110c0e---31733800789.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/28383526411.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c1c7c1cfb735eb1f6a8c08f103f0547e/14036367816.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/12916549531.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_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 17036 bytes
SHA-256: 7ec1299666dd07efcbc6b002b285f31e09b90afca57c7b261ec5912fa333a563
font_01_sfnt_off0001336c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336C 10240 bytes
SHA-256: 7677bd6ddf26481c04c14950793727f02887fd8c14a6ed077b05dc2485249173
font_02_sfnt_off00014aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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