Malicious PDF — malware analysis report

Static analysis result for SHA-256 5993b3fed48df7c4…

MALICIOUS

PDF

72.0 KB Created: 2021-08-13 07:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b8b36422c688c400de10cca548e86905 SHA-1: 2eaf2255c714065cbd018e2e4a8a111c32240252 SHA-256: 5993b3fed48df7c441942b0f4b14a42d10ab04b7be2fa47354d6d20f70260f5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. One URL, 'https://infrive.ru/uplcv?utm_term=netflix+mod+apk+new+version+2021', indicates a potential lure for downloading modified applications. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7812

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=netflix+mod+apk+new+version+2021 PDF link annotation
    • http://www.bufolari.com/public/immagini/file/596430158.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081b7cf240f9---82331869441.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/pobfdkd4fspstrnosoe3gj51g2/70254054570.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/13179241082.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dee0f2a21---55531602460.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/958b5e74fa51053993a90f09fb3ab7c7/38631787997.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tisajomugeradozaduzi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdb04e98---nigorafunaw.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/ok2ssiqujof3vfmbfgpjngou3o/xexuwevupozepodexaba.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/tatarukudekomeju.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/74106835810.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4c1809de6ec58efbf8da21903549d0d/dijeragunotuw.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/8578517090.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/wuvokokutupowinegi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/gezuxokelotakut.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/20545005165.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/68b11af0f0875446886e07862704da8d/89411876258.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072024b15156---xipemoguvopisorumope.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/jarajimewixotemidiwe.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/safomusufojexafuwo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd395eec5---54226502674.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/843e6ed4cb19164bf73c10d479de49f2/89566833913.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c9pgi4a7cvioaskddds985iqd0/rarujetusaxudifexidano.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65698976402.pdfIn PDF document text
    • http://101balkon.ru/upload/files/buzexejukiwaxuso.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 11276 bytes
SHA-256: 4a5ab3f3cde24548de362cf2138cc7a7e97134c8692405a53349c32714efca10
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1