Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc433b33436efda…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 09:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 318fc8fc6a3c00267480c80317ad4881 SHA-1: 25db82877d6af43846e812dde16002deb96bf7d3 SHA-256: 2cc433b33436efda1516fa81adde0ee3ec715f8fb462d8c92257ecda246028b0
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document exhibits malicious behavior by presenting a fake CAPTCHA and a lure to install a browser extension or update, aiming to deceive users into executing malicious content. The presence of numerous external URLs, many hosted on compromised WordPress sites, suggests a phishing or malware distribution campaign. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate a malicious PDF, likely designed to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=how+do+i+find+shortlisted+candidates+for+npower+batch+c PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4cc2d378052e7908c37e70c04d8140d6/88086455642.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/15119724947.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/329c1bf8f3ddef24f1fff41bb5fe99fb/kuvadalidomifegifo.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/pqca0nab3k9b7ej519f6scpia5/jusikijuwutetekal.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/wosisuzog.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/31239540128.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e617c76f1---32133548028.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/418f9b0005490b8ee9fd1b3bec95903c/tilek.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/vitakixovud.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/bb08d656e527923fc313534dfdbcf966/50663316498.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/vimedaxaxav.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/nanisirulomokonofuriwugo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f8db1795---6240042070.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/92403016629.pdfIn PDF document text
    • http://446888.top/userfiles/file/dopamemina.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1khqr8ehir2m3ebccm2ot846uf/59522338802.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/bevokitomare.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/tatej.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jomolavu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ro654i2tqp3em9udejkkjng99a/69197707821.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/60919247526.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/57911173779.pdfIn PDF document text
    • http://jarosi.hu/files/file/ribeponutokuzomawiribet.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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 18212 bytes
SHA-256: 0c8a3c64e060518d94fe5ef18cd201161b6213c99260984eae2e6edd8859e9d7
font_02_sfnt_off000138e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E2 10932 bytes
SHA-256: be6d6df9cca846fe150f5a8b54387de06e0911f94836d73dd8672c593730a7be

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