Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e21037bf9b85a76…

MALICIOUS

PDF

58.1 KB Created: 2021-09-19 21:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64ff971a1352551fb1c57e90aa849baf SHA-1: 424f6164da5018a48fd5df7c4ec07322393aa30f SHA-256: 1e21037bf9b85a76955b9407e83fe94f51ba2dab1d68a3f703d9076df34491c8
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript is likely used to facilitate the download or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7240

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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=unlockmytv+cinema+hd+clone PDF link annotation
    • http://karinameal.com/imgdish/files/dusisotunasixisorijuja.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/wazil.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/barofofabepuzawi.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/kuzelebirivemogukesiw.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/rarup.pdfIn PDF document text
    • https://kawanmto.com/contents/files/5566543089.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb5023c13---3849935905.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202191968291342.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/mevekazinagepufi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf5ce9cd2---23867015964.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/wanerinoloribubozizokavuv.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135603d2c517---15102695187.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/valoramigutukalami.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/38166733451.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/4ddc37bf588490551335be1d33c26a6a/mibowukizuzoxufo.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zigezubiwane.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mvluhj41q7pbmio1pco38drfiv/17639376202.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/8357401601.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/72825796647.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa52504852---xarowepijifupediruzu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jo7enp1uj0rm0vp7bd4lf581ra/dujixuki.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/22874359430.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/45857166232.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/gemuvanofezezoziki.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_off0000bbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEE 10644 bytes
SHA-256: 79a208cfc5d0416ddd47d5349f708b0411973396f5cf8091bebcf7341e7587a8
font_01_sfnt_off0000d41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1