Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b453f0477a1129…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 10:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1faebf7c4e649c36bf7327e47f04e23 SHA-1: e272819d6edc3a8f471d401c1346e02e054cb516 SHA-256: d6b453f0477a1129279ab26d19049491a705651b0ec5e8178ecfd35ac92c22ee
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the structure aligns with a link farm used for distributing malware or conducting phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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 http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160858bf26667b---34088192033.pdf In PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/61201224108.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/87661782948.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/nonitomigof.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/vivofalofameza.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/76944164448.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17821801879.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/nomapugufosefiretapuf.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/gobesemeniziwu.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/74396156183.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71134335699.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/gimotubijo.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/25997694093.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/35529069078.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/99946339110.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/34198647635.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/22301431037.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6e53cf7f83852113d2451fc1305552b9/rubewekewilujasatojepose.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/97827586603.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/lunuzulilomopusibidevij.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21848a7a0d---29033457018.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/guv0gj662drgqr6scqpunlv0o7/jenenewiwaf.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/63183344042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=manual+pals+pdf+gratisPDF 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_off0000bc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 10512 bytes
SHA-256: 783fda5204ada91d41eaf41844515532d818b1ec15bb33c80484ad92eafe699f
font_02_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 15980 bytes
SHA-256: eecf0ee19fc246ab10bc3ff7b36fcc760d8ff9d53a1a39883fb85432820ec38b