Malicious PDF — malware analysis report

Static analysis result for SHA-256 431140a3cf7ea0ea…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 598d32c2923af2e5b1518119d609c5d5 SHA-1: 740ba7049aca3d6945478ea8bf000d360f20296c SHA-256: 431140a3cf7ea0ea210057c8a21a21902cdd50713014c814af31d8f72232a7f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF itself does not contain readable content, but the heuristics indicate it functions as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c328f4012---nokujekamekugopi.pdf
    • http://sozopolihills.com/userfiles/file/xotamekeropuwepawafifudix.pdf
    • https://luiginoiobbi.com/userfiles/file/nevufomadig.pdf
    • http://liga-stf.ru/i/upload/files/torudolebexanuwomakaw.pdf
    • http://ke-sen.com/userfiles/file/1631925143.pdf
    • http://myhomeinparis.com/userfiles/files/jovalatawunazaxodu.pdf
    • http://houtackers.nl/userfiles/file/53091341263.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/bujazuvuzosafanelutowaxap.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613994e497c52---46113173977.pdf
    • https://santevita-bg.com/ckfinder/userfiles/files/51122868185.pdf
    • https://bahceneryaman.net/public/content-images/files/nopirowebuwo.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe302253bc---91947007972.pdf
    • http://freestyler.cz/img/file/tuduvawubogazubaterozor.pdf
    • https://shevtsov-art.com/uploads/files/wapape.pdf
    • https://barcelonacentromedico.es/files/galeria/files/31458570869.pdf
    • https://bongkartuantakur.com/contents/files/gapixazoliteget.pdf
    • http://mingmitrcoffee.com/user_img/files/34882975024.pdf
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/37865635072.pdf
    • http://sreema.org/FCKeditor/file/93120482647.pdf
    • http://police8coop.com/UserFiles/file/reloli.pdf
    • https://mt-creativestudio.com/ckfinder/userfiles/files/vuvapetabekuvul.pdf
    • http://paillasse.hu/userfiles/file/jizisusosewuduleno.pdf
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/robusu.pdf
    • http://yeongwonenc.com/userfiles/file/36702363782.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=block+craft+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c66d.bin
9ab22c438225513ebe0cfe0db482c3d92b651ad496f054513b167d58932eae52
pdf-font-stream PDF embedded font (sfnt) at offset 0xC66D 10452 bytes
font_01_sfnt_off0000de65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 16792 bytes
font_02_sfnt_off0000f677.bin
5438b7a6f22f66d1cbe37171c4152b69b4fbd7983bda8500cdfcf4dd531df175
pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16196 bytes