Malicious PDF — malware analysis report

Static analysis result for SHA-256 4901604d6ee8f6a8…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 23:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 86ea50f451124756f830f9f9a22a895f SHA-1: 0f7529b0c72196ec64371ec2a46ee73069232187 SHA-256: 4901604d6ee8f6a8b7135d2acf832f6a29f5fe496f431aaf177a3b31f5b4490a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URI links and the overall structure indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://silky.ae/images/bulk_images/files/banizoravitumumop.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/benutelurozenobux.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cdd7ee396d39abc49bef277bbd192ab8/sifizezefagelus.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/97992247856.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b5993fdfa15c894d1993619db794fc2e/nipozemoxabivuvu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c95f6e312a9---fiwunowebufobivemogur.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b833b8ade---10809242297.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/2sebccdc3pmiq1lbdovrej30fb/6061917218.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/xatazejisipubabimezezo.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/50497291093.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/79d05e1459d6818c617f7404207c5c0e/xexoxikavif.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086b75811f86---29903189430.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7c85eefc8378240bada10de9f0b5ca34/67853824646.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/bb211a9fb1cce4beccde6681922c1f07/68091829886.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/61973393522.pdfIn PDF document text
    • https://rosycaffe.com/file/digibemawilomababale.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8ab18d3c---tipadoposotebomo.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/41020693883.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/53451764561.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/zorunitili.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/78528616622.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/tenesidomeredalewiguwuzax.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/pulatiru.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/7524205938.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/93075611659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=guide+words+worksheet+6th+gradePDF 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_off0000cfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCD 16860 bytes
SHA-256: 1f1f3ced39a141cec464c66b046cffee4def447839e11f6a4342835e2c029183
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 10860 bytes
SHA-256: 2022b5a3b93461832a3996f1f4d790177673abf95890f34c814800c762638e24
font_02_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1