Malicious PDF — malware analysis report

Static analysis result for SHA-256 56c32b2760632bbb…

MALICIOUS

PDF

200.1 KB Created: 2021-09-24 12:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d491f0e2ea262894603dada950c242b3 SHA-1: a5043c1aa65b5201b0ea7455fbc840e95c076d71 SHA-256: 56c32b2760632bbb927407eb50455bf83ce9cede54e40df67441dc9b53cb902f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate a callback phishing lure, suggesting the document's purpose is to trick the user into contacting a fraudulent entity by phone. The presence of external URIs, including one pointing to a compromised WordPress upload, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • 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://ballarioarchitetti.eu/userfiles/files/69938803411.pdf In PDF document text
    • https://deesudcoolingtower.com/userfiles/file/figozigubuxotoveto.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vavaboroti.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2u87t59d66mlsvqlcgu6hi0nag/15729682876.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/75286805326.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614a233474c7a---silafajusaxuziwulal.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/27798602401.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/rubazisuf.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/lukulivo.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/9153897868.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/almrfnik4qr686141ct9uei7f2/sejigekilevar.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93897506221.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/wawixiragusalejon.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/44914347228.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f284513a6b1e76a3b103e6088e8e56bf/3771459380.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/35338742188.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/93397068417.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/15840821516.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/50030925846.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/veranasofafebekiti.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/xinetumaxigagiwo.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/18006811562.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/53818819633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gaudete+et+exsultate+pdfPDF link annotation
    • 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_off0002b1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B1AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002c9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9BE 18964 bytes
SHA-256: 81c4846f883c00f3938762fd7e2eb9a1f0ad31fea6e7b9e209c58c08adc6a1c4
font_02_sfnt_off0002f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F93E 10316 bytes
SHA-256: cebf844fbed06629771915aa329c2e3d44d7af32d4fdd26793ec93b593383602