Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90d050216fa83d7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 03:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8da0176d8a4284ed187ec6b22206bb84 SHA-1: eebed5ec1af19bb5f312fe346237b9048570d774 SHA-256: f90d050216fa83d76cad71a7659202788cfcd7041336840afdfde2d14d0570ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/kaboxosavexejegebafanoko.pdf In PDF document text
    • https://taxforce.nl/userfiles/files/febevupudugojibi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c1di1rmde4tejits4gmnl8lrmv/geniror.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/7mp836lrrsqqsf6fuuqun6efd3/56865247674.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/42296242211.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/zeminarumotimuzanexe.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nenikijolata.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/66401653767.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/pafofagas.pdfIn PDF document text
    • http://ave-france.com/pics/files/35250934597.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lebenusi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903274ccd8b---didosamakuve.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ddebc4b256---92466082448.pdfIn PDF document text
    • http://runo34.ru/attachments/file/15335622189.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/5865728278.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/lb4de0hs747mnvi6iomucon8i5/76259750061.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee29420eead---jabajebiradadilofik.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a7a007c91a7f4f3f96f23c9619c718e0/30511743085.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7832fdf579---43651471597.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/94620630547.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73c54490b---sefexizudedaj.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/jaxajomanoriwuruk.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/86060937916.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/mofinivakaguzosono.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/68798313847.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/vemusimuzasiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=freemarker+tutorial+for+beginners+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_off0000cdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 11152 bytes
SHA-256: 014c91ce6cb095bbb234960b28cf1126a5ad3a5183722ca069fb7bd535b80980
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 18232 bytes
SHA-256: ada4dfb1e081e4b766115be0e87b4eff31e46fa94501ed3ea436fa01e093be54

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