Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fb8c9f90423fb7a…

MALICIOUS

PDF

95.8 KB Created: 2021-09-05 07:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc94c0acf554b3cb89e8cc5423491f29 SHA-1: 96c60b4f01a2492fba9d77e90da2b502807aa2b4 SHA-256: 9fb8c9f90423fb7a0e6612b993dbf2e5c47b7fc97356278d1ecd8dbd22a3d43f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it's used as a link farm. The primary purpose appears to be redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://coretry.ru/uplcv?utm_term=2008+suzuki+swift+manual+free+download PDF link annotation
    • http://timecraftz.com/userfiles/file/7300011503.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377d783408---bevikipezexuterufat.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd0e79b83---58826322512.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/12995813359.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/bremi7psclqhml4bf9lqrv0dcd/38626966947.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8fc642vi7k2f8du0ha1o3g9b6u/rulakusipit.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/powuxisirovug.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093f267e3bc3---kafatuwamoxefevewejazufa.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31917d61b5---71244875518.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/41378852684.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/mujosubopobeduvuginixupo.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/fazutaxarasena.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/72509149373.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jerukusifudafu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123ef89d8cae---luxonoburususukiva.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/xorovogotaxunisaso.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/61422120019.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/cr9911fn4lt3pm24lon65erp5c/44333981784.pdfIn PDF document text
    • http://mlight.cz/archiv/file/58202722867.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/32605845663.pdfIn PDF document text
    • http://delvalle68.com/clients/54584/File/mejerubifozogi.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb5622cbf0---jusijuxekujuloxolibop.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785ba6849bd---16105415389.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/97048591371.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 11204 bytes
SHA-256: 31993574b66d828283d9fbbade3ac828d0cee286e6cd7a5a26111008c6bb3e4c
font_02_sfnt_off00013cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 20936 bytes
SHA-256: f9e5cf07e0fb804ea28b6094673626bb60e6a076076a437fafc8d50e032b6c9a

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