Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0eaf9433aca5fd…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 01:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 81d0b2a3e91f61b2917bc52c6f42f5e2 SHA-1: 39ec5c9b1b190866697d89c059468d5c3e56da48 SHA-256: bf0eaf9433aca5fd9b957dd413bc0135c6a5739cb09a4c21b76594ce0f7098d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links. Many of these links point to compromised CMS uploads or disposable hosting, indicating a likely attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=social+constructivist+learning+theory+vygotsky PDF link annotation
    • http://seto.cz/uploads/wofisexabibunefajipox.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/93283033449.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/gozilerasukagaj.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7b046ce20fa8f7e55cd6d0c7fbdc20e5/7132770398.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/33459924220.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/tegirozol.pdfIn PDF document text
    • https://petek.biz/resimler/files/94907379890.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/vixajetadedizojelavoxid.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/15234655515.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/54502167a57958119f81625526219d0f/kufuvekuwapobed.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/59137692128.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/69719316333.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/97449520227.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/tafobazubosidi.pdfIn PDF document text
    • http://www.neoneophytou.com/ckfinder/userfiles/files/13775025964.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/fedevekopuwobasiwisu.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/7716759211.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rigazovonegosalafokakabo.pdfIn PDF document text
    • http://hla.vn/upload/files/nilubepodirogujirotewu.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/betivizefaremel.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/86088829119.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a487d43912cfaf784b776155aa82f180/redoraj.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/vemapijozawuzabemiga.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_off0000b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 17140 bytes
SHA-256: 5527168816407548e8c052657c6dd0e7753a7797c237087a9cfc45d117189d10
font_02_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10956 bytes
SHA-256: 397d8deffdb2177b358546fc8964b83db7d3d187938f417febba6652a97cb6d6

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