Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4631f60aaa16a80…

MALICIOUS

PDF

63.7 KB Created: 2021-09-25 17:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2af98f5a6346e0527fef1b4a16567571 SHA-1: 9c1150b82d3075e86f14d9272f5ff14072ed5c5f SHA-256: f4631f60aaa16a80791b9482ed33619fabe59401f9f18403ec64cbf18e9713b0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a Pdf.Phishing.Trojan signature. Static analysis reveals the PDF contains a link farm pointing to numerous external URLs, many hosted on disposable domains or compromised CMS uploads. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4631

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 http://letsfinal.com/userfiles/file/84554591825.pdf In PDF document text
    • https://atlanticcompact.org/userfiles/files/gamowosomusiziwusiwa.pdfIn PDF document text
    • http://foodchemsino.com/d/files/52507290611.pdfIn PDF document text
    • https://thepainter.asia/upload/files/ponukeditixujutupajev.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/15004368177.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/83110043314.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/xujafonaferijatexigusaw.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67198206871.pdfIn PDF document text
    • http://roocenter.ru/upload/file/wujanadefudo.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sekavovatixazumefefow.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/nazerusozitonunibaxibemoj.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/35046427061.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/memasuwube.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378abf84ecb---35012440247.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/88184299502.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/vulijafofuvad.pdfIn PDF document text
    • http://fruitvita.com/files/files/xebagowulurigapa.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/64609417050.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/346a25be2eb59dedbded99a74791757c/buvufubek.pdfIn PDF document text
    • http://exima.kr/userData/board/file/dexanivowilebaj.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/70529502690.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/45490391148.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ues3p2frvv9h0egngomnvl8e8j/15197922021.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/29500969695.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/82f37b2ed90f06502f1d6e2ccc4e9c7a/81031544389.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/fimirijitapelux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=home+design+makeover+modPDF link annotation
    • 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_off0000b8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B0 18032 bytes
SHA-256: 8782d8ae9d76c4059aaa58ff8e30fe1a9fcdb2a67f9993bbd8eb4ea956b8f29d
font_01_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 10596 bytes
SHA-256: ae5e82196d4e65fc926132086126a4508e4fae77e23bbd9b68513dfe1fb7a0da