Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ef5476cac670a2…

MALICIOUS

PDF

91.9 KB Created: 2021-07-24 09:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 67e758ff60f946cb8370a22d806772f6 SHA-1: ba181793a71d1dcee226a6c03fbb3848b8ffbfc0 SHA-256: f8ef5476cac670a2a065c5b0c08ade5cea074404a22f44788936e04fcb627bf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://armanetti.com/images/83013787528.pdf In PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070222204373499.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aec3c4898---dajonewiwepumol.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/64609176719.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/luzof.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/57485deef0460e4aa6c216c69eaf4c1d/jemubikerabeg.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/96dd62cbeabb18dc99982be744991bfc/voviw.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/meluwenukemam.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6ced20d1f---41984774486.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc303a2682---woberora.pdfIn PDF document text
    • https://vestol.bg/files/file/nesajimiximuk.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/gujuriwefikeroja.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/90e1vbbaj1htb9a4sgunfpsfj2/zozizurulapimuwigofinavoz.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/vfojjebb18mdvvn3etmcuqam1m/deganigigibi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c1457ee4c---bisekaxizuresopi.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e0452a15ade9addf7360ba92a155abd4/21458723797.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5be089372---dirikamejowapadajamow.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/85181479048.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/4b5649a94edf169d825c6569e2ffbd8d/zagit.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/2743462922.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7f58c440843c679bc858dd94198f04e/53784539545.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561f829b38---fitaliziwofositosasotizo.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/33036299232.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/39962355238.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/xavinevutaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+prepare+for+the+pmp+examPDF 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_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 10392 bytes
SHA-256: db0e757eabcae573f1e400ea868ef3924544288fd7df9742c9346fdc21884912
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 17644 bytes
SHA-256: 56a6574365ff1d3132115048fb9b2a57bf4c596b7f6b3e6a88b1cd8e7a67e9df