Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa5de50fd50d419…

MALICIOUS

PDF

73.6 KB Created: 2021-09-16 10:17:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c75962da42cfb51881d6191f2ce8e8e SHA-1: 715e3d50c959842cf99c0cc6674c0dcbde7dbbc0 SHA-256: 4fa5de50fd50d4199be7c8d06ac6d422f9e54a8b792f1922f82873724bf20e86
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, one of which is disguised as a download for 'resident evil 5 for android'. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of numerous links on compromised CMS uploads and disposable hosting suggests a link farm designed to distribute malware. No scripts were extracted, but the PDF structure and embedded URLs point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://nomylo.ru/uplcv?utm_term=download+resident+evil+5+for+android PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271ddd2679---pelefutekemonevafe.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/narobuzilewugavixomivujo.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/64621056361.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/f03tgsfqo6btchtskorco05pkn/juloke.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/44036679943.pdfIn PDF document text
    • http://africareview.in/userfiles/file/95488830473.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/95028289883.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/73887584284.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/fapiromemididugodoba.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/57d22f77df1a87d1bd8c91c9ae69d744/nusavoziwudul.pdfIn PDF document text
    • https://cicimanis.com/contents/files/53704104956.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/fa900d9243a7156fb38abfdcc2bed3cb/bofaxixomidodaserugegiw.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/34188847838.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57963199855.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/foxiwapoxoti.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/lekupalupakinopumuzagi.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/68426999475.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/bidizalivitejanigonamuji.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/nikatuwo.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/sukute.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/26367343826.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/82598574443.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/21563181800.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_off0000bca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16732 bytes
SHA-256: 10109b3d0239ed8310b81a4e91e1d005d7d51e9ac049e5346453ce7af8eb3682
font_02_sfnt_off0000ffe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE0 10632 bytes
SHA-256: d07d20869a27186659c1bbedc8799d74aa27ae41939e51b19eb7c0d2b0ac03a7