Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bc3af760b486fc…

MALICIOUS

PDF

94.8 KB Created: 2021-07-16 16:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84e002bde9cb7bfa2d9a1622285e89d9 SHA-1: 044c70d4aaeb78b6ebc83ccbba41042caee69413 SHA-256: 15bc3af760b486fc128651a64f9db0452fcbd4d411cc6f762a2c2302948d7d37
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number under a pretext of a billing or security issue. While no scripts were extracted, the presence of numerous URLs and the callback lure strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • 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.
  • 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://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3e1f8c53f---16395174352.pdf In PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tvcsfqlimie1q4m463b4qdnr55/63423182868.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940cc96d2be---90194184849.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/83552294947.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/66947772429.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pupibew.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/9443729943.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b35b6b0c4b6bf154ea642e860629dedf/69911385793.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/seresewixavilekixim.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077f743c0a8a---2251970928.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc3741212053943d65b50dcb2e94f91e/78492537243.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kofalufumaxaxetitufiketu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6caba1e786---26879176226.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e17b279b33---zuguvijat.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210518012423.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4321ae792---70427415530.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1866e28b8---vafux.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1kjhqdn0bh5s98ndnrmuacdmhn/pakukoren.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22470932738.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/japuwes.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ee9bd94fb---88866383556.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/1254930505.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e22e97e8a99d8a60fdbee3d1f4d05715/xamuxobeb.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c0bdc4d0293e550af7fd822fdb963337/43981827459.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/masatona.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h3js7j2pcm727mco714vq09rn7/xupumuwaditobobus.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/79266015972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=nba+2013+rostersPDF 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_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 10444 bytes
SHA-256: cd0e94dce2c422c988c5386963669400e4dcadfe44be6101b0a8cb3ee9cd1db3
font_01_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 16976 bytes
SHA-256: 58b2a18c97d07ff9c59f086a159ca0e729cca3b53ca757cf4ebc3832941af7cb
font_02_sfnt_off00015618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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