Malicious PDF — malware analysis report

Static analysis result for SHA-256 4026ef2fe6149ae7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 10:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6065dc8f845d3184fc60e14a9e30d6b SHA-1: 1556958330c04822f652c5dda7c217dfa6b6939b SHA-256: 4026ef2fe6149ae703d778206a2d465b1f859e21afd390348687e612249ff7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=listening+a1+cambridge+pdf PDF link annotation
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a2e32c6d3---xinonuximawusidosov.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a6f0d98ab08288de19794734c88dfda8/xafaziwupotem.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a837f31c5d07168a1e8813c58476c6ad/mafoxodadurijitadizegi.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/83077406518.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210707_203655.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94d479d3b3---nubotezatupa.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/87789949859.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/11692635006.pdfIn PDF document text
    • https://fishuntpesca.it/file/dosefa.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82bac78d96---rowegesikatikuze.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaa7f4a17d---7166655999.pdfIn PDF document text
    • http://martonelektro.hu/files/file/sowilox.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/23040137990.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48231955374.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gegodu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/demovalomowozuwuk.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/14357252776.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/30216374489.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/susinufivusizuzadefagis.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/mitonozuzejowopusi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160710706ef4ae---numarowij.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/firutivapaxerevowon.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/sor8tlf82904rrm9oo1ggh4jg1/81782340373.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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 10948 bytes
SHA-256: f15aa14106350f985d5205de4900941fb8f834a406db180e67ea64bc19e2a5e0
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 17124 bytes
SHA-256: 9dd2b886e5c5e65446c38fa6ab9b74cf29c7ecfad8f8d384903e4a81091e3992
font_02_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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