Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad90f7af958e14d…

MALICIOUS

PDF

89.8 KB Created: 2021-07-28 04:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ed3d57314d4ea30d1a4d6cfe770a4400 SHA-1: 824a896f7746fe62f17b2ecfd427febae14b7129 SHA-256: 7ad90f7af958e14d5d6f296527a89ad0b8f74293ec86bf8f5a3e557847af4ffa
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749e5ea1e91---98025282536.pdf In PDF document text
    • http://zovsh.com/Uploadfiles/files/94802063640.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61f961dd1---52115335634.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/vepok.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39292461429.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f79ef2e681---96740416062.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/78809699098.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1401ea65---dubomovozegasotifosi.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/gukugizaruxaxaji.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c4380a23---bozamabilurepulutitolix.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/64620853877.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ede9c10c4---43053144598.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/21870865424.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/30081853266.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2490bdda8722d4a9384f82726640139d/96484415374.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/dfa139980f05ec30ad0e24afd0371ed9/mirerutotunitexaxenis.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470225de1a---73311586163.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/3898840556.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/barumiguvupaguranina.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b5dcfcc8eb80d6696e80b51f5480fdd1/zijagutilapofapisi.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/52613080411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+program+comcast+remote+to+vizio+sound+barPDF link annotation
    • 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_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 17272 bytes
SHA-256: 4e605e9c588cfcfe7c201fccaa92acf7455ba32552aa245dc7ecb04feb3073c7
font_01_sfnt_off0001262d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E44 11252 bytes
SHA-256: f44353dadaf88d5ee0047b6620c6c09fb3390e1ab40590a5c3b327981e3d7d46

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