Malicious PDF — malware analysis report

Static analysis result for SHA-256 1744e0e6208f4af4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 04:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 42695e10c6b5c94f0a51efe177c83b55 SHA-1: 63f95deb91887a27ee020b7fba47279c7737e895 SHA-256: 1744e0e6208f4af4ba8eb2c46a00168a8e7e3d542bb8369dc27c6879e73739eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing operations. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://catamma.ru/uplcv?utm_term=wild+life+game+apk PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb8e9d12b---27513468234.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/pasajamedasoliruzebuxose.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a4456857---xesejebe.pdfIn PDF document text
    • http://boldogelet.hu/media/10621889620.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450d9c2d8c6---bazonixozepopisot.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/sakonomabodasezudu.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/gesitepofenewexabi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614570a7eb077---pobubimufafepasijaruparo.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/kupinobubanofigixu.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/78327883858.pdfIn PDF document text
    • http://juha.be/_files/file/derodewadidalu.pdfIn PDF document text
    • https://cargobull.cz/res/file/sopapiv.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/rezitopopedejidixilirosor.pdfIn PDF document text
    • http://consade.com/userfiles/file/nizazuxuparo.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/sososoma.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/rawawi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/44498373558.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/43671830113.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jomir.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zugemakoxaxixuxi.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/13363735755.pdfIn PDF document text
    • http://klinok-saintp.ru/files/60640596308.pdfIn PDF document text
    • https://mkontroll.hu/File/rawemilinafi.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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0B 17148 bytes
SHA-256: 9d3c278a19f3f62f0761dbf0180eee823592f673f7a194f6a39323bfa6589420
font_02_sfnt_off0000fa69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA69 10336 bytes
SHA-256: 0a2346ab0ed5b2a4bf1795728518f3e7f3b1ff3d28456af5eb513164780a15f6