Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f43f2c289466505…

MALICIOUS

PDF

108.0 KB Created: 2021-07-31 08:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b0200f93cc41b7e284c49e4a691dd8c SHA-1: 4873283bb2119f94c28e0090afa2c014792cfbd0 SHA-256: 2f43f2c289466505d42e61303d11c196a2bb1cbc9f22e5971515a291655f5e22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=tabla+de+equivalencia+entre+procesadores+intel+y+amd PDF link annotation
    • http://giaoducvietnamtv.com/images/ckeditor/files/dukipotirulirira.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210607223648_w17hhi.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b271473785---33654468075.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c981db0da2f---29849126620.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/soxufet.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/40778327244.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/79384466469.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/59633381360.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/96547775815.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc32b25f54---24684423518.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/43818294207.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/49617013298.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/36232586168.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c46861f0---pemufemebidelikavumunoset.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/nizutatufixijuxopoduxiten.pdfIn PDF document text
    • https://lecapsuledigian.it/file/gapujuw.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/gijaridagejatewubedid.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xerefirisufun.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/52790719915.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/lufutubowufu.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/bagelelulejojivupem.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gcre4l848gs781oc43ijee59rr/jerogajamutiguralotagitax.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_off00013c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15476 11204 bytes
SHA-256: b3058aef857c5f5bf1d959245f0eec5a59bbbe72522007826aad2396ad3f5874
font_02_sfnt_off00016e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E47 19144 bytes
SHA-256: e9f687f9140494396ff76c354f6cbb064973bdacb4ac4716203584a646d930f3