Malicious PDF — malware analysis report

Static analysis result for SHA-256 25149adbd38b6215…

MALICIOUS

PDF

87.2 KB Created: 2021-06-08 22:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5bc8be6975194b3054eafeac01be26bc SHA-1: 63bdcabddb195ea4e4fa29dc1ce71aebbe8a8a15 SHA-256: 25149adbd38b6215f4e4c253a45cd3a4d67b80ac92c83ad0447019a81b89fbe6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://drafthe.ru/uplcv?utm_term=dino+game+cheat+code PDF link annotation
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad044ebd39d---38961188722.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ae07e0fe48f496fe4184802be6503b3e/zudusaxexikevenof.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/komalojemobofuxim.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f54b2c77f---40623376505.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb6dfeadf8---xuzibitodofij.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/86517911320.pdfIn PDF document text
    • http://dentherapia.hu/files/file/125171460.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/serirevinil.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b779157cc62---19732566450.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099eadade4fb---92462378907.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160945f17bd6f8---39611038536.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/molafobugikeso.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/ebd5f06abc4cf119c9a9651f64500291/14224302456.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3955d9950c2fb67924b1a4103a4ca46d/xopunorebakejupo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/08ccac0dd1f1a7e3aaa77945c78cd72f/warekomakubivipaw.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/livadojadizaf.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zowuvuzoruwupej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 5048 bytes
SHA-256: 17930694343446555c279abe5be505417445bb2eeb5b830ea18ca3d6aab743b9
font_01_sfnt_off0001146d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 11392 bytes
SHA-256: 0e413d555303fbe238e114bc3b2b23fbc6b9c300d14b6bcfc5e2f912cfa23bcc
font_02_sfnt_off00013b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1E 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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