Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bce74f55df8401d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 10:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 296d2fc4b9d196f252681d761b4b19f6 SHA-1: d290e012e86e61d416016ab998915a56c826d5df SHA-256: 7bce74f55df8401d62cbfded7257cae16a7c74547b5c5b57fa93db8263d6d068
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised WordPress upload directories, suggesting a link farm or phishing lure. The ML classifier and ClamAV heuristic strongly indicate malicious content, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc3f34df3---wumabavagemut.pdf In PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/61442788972.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/52449837558.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606c979cc6367---77168215387.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/42393060376.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084623c02073---84880386396.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/10786776730.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0e1248277---fozalakupura.pdfIn PDF document text
    • http://www.polni.si/Images/files/favesevef.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161096528d1c03---jopapirep.pdfIn PDF document text
    • http://panteres.com/files/files/gedakiwifepuwedaledukixe.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/16860004267.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/69189061211.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e8ab8f6f59c5e1e3d7d80e6997ed37e7/81048373347.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f458b0b9e33---tuzuk.pdfIn PDF document text
    • https://somogyplusz.hu/files/kefuxoribapazomedapurer.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/42930918039.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210702221215.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/31191169514.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696f54c6e9---68175323263.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zuwuzifaxafifa.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/c34d840ca0edd0459ce111b6cc6f8b07/73252001249.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ohp8p0h3fg691ji3enu0aik0n1/sixijefotobafokalurazifis.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7e3da95d---67116954870.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/doruxasizuloxepawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=defensive+playbook+football+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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 10804 bytes
SHA-256: 31c8ffdcba375c9d442bb2fd87190fa32a89f0963d29ae7e095569943811cec9
font_01_sfnt_off0000f8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EC 18980 bytes
SHA-256: f0a7705e05b7769479ec24ab93f159d353d1812335476791206179c164ff4f3e
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1