Malicious PDF — malware analysis report

Static analysis result for SHA-256 efed9b0e04d5a9f0…

MALICIOUS

PDF

89.6 KB Created: 2021-09-19 07:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6caa02ad077d66ac04bbf711721892ad SHA-1: ddf451e475ea6f44d62d5a65221568fad420b075 SHA-256: efed9b0e04d5a9f0add1635d4bf664022bf3ddbcc0be28469fe35801853a1176
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. The document's structure and URL patterns align with common tactics for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://nomylo.ru/uplcv?utm_term=best+music+android+app PDF link annotation
    • http://biemmecommerciale.eu/userfiles/files/53692463341.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/22747817923.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/rikuroxefutasomege.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315b123aa51---maneredunevu.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/bunosigakugud.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/beliwufomidami.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210911130756.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f4ebf34---ruzodub.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/48433396821.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d9c602bb1f8ce86f2aa4bfb239c27124/91786850285.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/cb8d85e248b3be9c1597a60414c6bc2f/89234127896.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c60dca849---33817310086.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/janemurasobu.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141df762e9b7---11814174797.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/20629357528.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/zufolijerojifur.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/jelupeb.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/pevelejopotawivudozig.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/fuxujat.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/27013738736.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/55345850196.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/85858627181.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mipiweja.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_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 17628 bytes
SHA-256: 8a49d7ff2fb7afb72d5948592ae20abde60053e1d2da5e48d7dac995953bbb9d
font_01_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 10784 bytes
SHA-256: a434aadf5561f5b4d6f366d96c245cc463dcb17e5c889781613c30abafd4c436
font_02_sfnt_off000140e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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