Malicious PDF — malware analysis report

Static analysis result for SHA-256 279aee2e5b29ffbb…

MALICIOUS

PDF

89.4 KB Created: 2021-08-02 03:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13ffe848a8d901f5052e06150b2e3f04 SHA-1: 459046687d1f51168403c41a47ea5497105e4cfe SHA-256: 279aee2e5b29ffbb1426c6c707e6deb02b0406be43bc184809897e01b226fa59
236 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and heuristics flagging it as a payment redirection lure and a browser installation lure. The document contains numerous external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to trick the user into visiting malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ketchas.ru/uplcv?utm_term=best+play+store+app+to+earn+money PDF link annotation
    • http://farashimirooz.com/files/liguku.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/74800544887.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6894dc463c4d10b63be355beab2db090/nusepavorofi.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/ninadasi.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b2198c17740df54a38fc185aa2c7dad1/8786617919.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/aae0kj6v4hsstmhgasfn1klj0m/likekuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/djeod5j3sjml7a917gfb8jf4n1/21569525212.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/56256205575.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2f289ab41dd51d3aacfb42e925014868/1153794227.pdfIn PDF document text
    • http://uleiuri.ro/userfiles/file/ruremorozuxekerax.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/pulupiwipumupajiso.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/manomibowovamoluvine.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210628120935.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16094da9b8d1d4---18796027146.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/poninipexomebijol.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/93076077099.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be54b5726ef---mikogo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9a8741fa6---45040714653.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/86375511843.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/nividi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085658f19d5f---44601961039.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/b8814876d29232f68b03503aa49ed3ec/kuvigomixuwo.pdfIn PDF document text
    • https://efnnma.org/files/file/88594388344.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/bejolajugivubamilaluzo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936c8f77a---73522565361.pdfIn PDF document text
    • 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_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 16872 bytes
SHA-256: 36148698e7b20b50d25b24b01988dfc5ac214b80f1edad87afbbb339039d7d95
font_01_sfnt_off000125e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF7 10488 bytes
SHA-256: a44c0891dd32324e534253ed89dae775c12a3626c3c36ededb2c33ce9aa1da26

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