Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef36fdfb09d5d18a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 18:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bb413e294d97fb41b6e1e1d3947ff3d SHA-1: 60ddb8bc775f7212fa09d61bf8e034c48c49b439 SHA-256: ef36fdfb09d5d18ac7002241f90ea61e1ea2a6877940f50f085ff2887b362e91
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic findings confirm the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://acudrved.com/ckfinder/userfiles/files/veripelajefofikanokura.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160906b6673b8c---65124505587.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b430fefff6---99291381674.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c2d9f3e77---serosofavunupuj.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210526_180956.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303cc7eb09f---tawiriwemifarinakekeribut.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/41233233396.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b88e7d7b---94499599626.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/tsmspb1465tdq4git5derra524/28825787991.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2f212da87---13860112200.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/67287519540.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/lugibamezo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef9798dbf---28243673096.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/22579646205.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/gifado.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/mevemekojexusukajo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7804dab9f4---xageligama.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/21879217409.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/a492fa90eedf3d442688bd86c2758595/lutugose.pdfIn PDF document text
    • http://baby-daycare.com/uploads//files/202108120836099498.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ae048c699---48584124608.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/96427895129.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/49257532348.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4a76dfa6f570b438157af82870541814/8444701415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cistite+em+c%C3%A3es+tratamento+pdfPDF 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_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 17200 bytes
SHA-256: fb1d9fb0824d968124642ca188eb2e15e1ae7e9f2717b2005806821948a50a80
font_01_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 11032 bytes
SHA-256: 89a0f070834d5315bdcd95c46c4d91c883bba6c5db04ba86348a019561ac6191

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