Malicious PDF — malware analysis report

Static analysis result for SHA-256 0428d6509b513cbb…

MALICIOUS

PDF

102.1 KB Created: 2021-07-24 19:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c4383b7256492307fb419e0e109e910 SHA-1: eb4234e61c1dde2ff9bee2ef9f7f54010bcda443 SHA-256: 0428d6509b513cbb9315a51de53486d393155250169e77560f39d1a1a8ce7e61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://ambvet-trefontane.eu/userfiles/files/nikavokub.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d93090fe---fonulosoje.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6c7be5f2839be41607c8374d8b7c0684/43892153776.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17313ce462---vonifu.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/dfc90d8ba8d332a42b7b92defb9dab40/83868396458.pdfIn PDF document text
    • http://zae.me/datafiles/file/86385315256.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/177dd9c5or6svogcghfh901pb9/gobafafogusemomotisozo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1ce5aa53b9be798c90dc31cf698bb9b3/13752653277.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n2ak72c0tcuftotbdf6fh0h3sf/kuvifubuleg.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2khofm36pljlconm3ismni81k5/papelipinagixivaresixav.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/82037462353.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/kaximizuweposeso.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/jidawabuf.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/57422167090.pdfIn PDF document text
    • https://emprenderem.cl/files/3383269792.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/garumatepikopu.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0cff7b1e1---70909801387.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/njr7hf2afgdrdu94a5te0rop0j/zoxurizanufajadiwigog.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/53791194502.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2nj6p69fqfumb0hh2pfnvgnun9/xozorebo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38e5d9191---goduwale.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/irru4m2evnqtfpi8jc0jg56cg0/degerenozoxuxetaxibemomi.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/dogigivoni.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qfqmv09gbetti9a5k0168agkuu/xuvevufujofox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=national+education+policy+of+pakistan+2017PDF 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_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 11140 bytes
SHA-256: 76460b1ce50081d46cf7315a31028835f5388de370e00e16cad748419f3d320f
font_01_sfnt_off00013fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE1 18304 bytes
SHA-256: ac8b9b348fd108e41bb11058458e1e071c764104b86ce44f1bbd5d7208030845
font_02_sfnt_off00016f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1