Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6242ce4bb0eefc3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 01:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32e58c44240c33123dcc3861473fd29f SHA-1: 15aaa6428c2b0f6c18dbfe72c9ab5a74fb8cb638 SHA-256: d6242ce4bb0eefc3612d69f5c7d40f409c4459317c5bac3eb2f8cbfa4728b307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h49ulhm2gfn1cruhrlc0ul4i06/devejavadapirijitewin.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/699918446.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/jekadajewifel.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/pimotubez.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/jubobupiloxelakumusam.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/zixal.pdfIn PDF document text
    • https://lordoptika.hu/files/files/samugegubulojezezepa.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/masegorigezunisumon.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/205c3beb3b44f298844a5ea142200e98/sepimibefexurizebe.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071f886a9dc6---56589988812.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52d079af9---penakumera.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/89869102879.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce15a45b5d---rorezaribazate.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/zilakesezosoniwarute.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/tabepafenofokibipe.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/78194795479.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/i50s5190rkf04918c14o0r1qn3/21126101906.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/nudobixojeluzi.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/e1f2ed02bafff3ed537539042c0b9bfe/basedap.pdfIn PDF document text
    • http://hidropro.hu/upload/lagabibotinunutuxasit.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/33005434256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=gargling+with+coconut+oilPDF 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_off0000bff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF7 10432 bytes
SHA-256: 05ac49b1b9a5b5d8dcadc423ede0c96fe4af7ef2a953feccf66a7eaefbcda1dc
font_01_sfnt_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 16004 bytes
SHA-256: fb445c95edd6ccaf943b91f698b4b4324a7ced5b2e159e13e095e306f48f5395
font_02_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1