Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e50c46e66b0b22a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 10:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7ab67dbc57b3859c8b27362e29cbcd3e SHA-1: e6772880adb602635a5ae2eaecb83ad1e0103c7c SHA-256: 4e50c46e66b0b22a219fa7aeecc6010bd5f34f976776b2277f303f6b4299cb83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=tetris+gratuit+pour+android PDF link annotation
    • http://rspon.pl/images/wyswig_images/file/60254196662.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/tuxujineroxanotifen.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/lopebubuwezirufujepogof.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/07/66558913614.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/woribupanavewopinasuse.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/gokakik.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/zamalaxadase.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/a839055e9e9406d27bc718e6731dc884/xukuzezuzojanisoruputorud.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/31643931686.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zinoveko.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210903161710_2z0tjr.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/6373639673.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16134beb7aaa89---puwuwubi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e432acfa---44994856934.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77356321109.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j2hhbr8l7f4oi667ntruuioige/75181471089.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/ginov.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/4907681686.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/zilejidusupofek.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/tarufajojilifitofikufa.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vilup.pdfIn PDF document text
    • http://njchemland.com/upload/files/17919946648.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/82039729532.pdfIn PDF document text
    • http://aa-nusd.jp/3431883132.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_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 10584 bytes
SHA-256: b3c6c688589d3b6169aee54be185675b56e7659b2588917ef526b661d92764ca