Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9b479aaef9c1d7…

MALICIOUS

PDF

88.6 KB Created: 2021-09-09 06:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 318d0085f11b02d441aea979bae6cb58 SHA-1: f3440edfc8d62d518c0b5c4ff47b84545ee4546c SHA-256: 7c9b479aaef9c1d7448091a37cf6c16e0fa99ff8a039091aad5d26537e8029f4
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://degeninhotel.ru/admin/ckfinder/userfiles/files/memaperadogaxenilemix.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138115335c54---gitexunageragosepimipuw.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/72542069282.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/62204613381.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/685ht996srmnpbnl7ksj5ohh7k/kikenes.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/gipixiwerinisisisipinen.pdfIn PDF document text
    • https://filetorme.com/upload/files/vuwenafo.pdfIn PDF document text
    • http://vecsecity.info/editor_up/sobebudipide.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/32029963121.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/xuroxefexujavaxemofevaj.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed410f522---zogodi.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/53434586811.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/86699375674.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/vuxeputowatezuzova.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210904115538.pdfIn PDF document text
    • http://asqcert.net/files/files/75583427742.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/52764398045.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/37954459025.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/zolusap.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304b250ae7e---kegojukoruvivapumujejon.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a8ca1dc9f9b15fe6ab6b65e15ea5441d/34494894975.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tupega.pdfIn PDF document text
    • http://pjteam.hu/uploads/pofirutudevijolewoditas.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/58917330206.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/revewajizedaruvikur.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=d%26d+player%27s+guide+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_off0000ef34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF34 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 22352 bytes
SHA-256: fbc99601b43f4135c1d0a588086d5f471940170ae3d60ce016ced9f05affb1b6
font_02_sfnt_off00013cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1