Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5453b51c4e9bd95…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 03:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cf313f78b6aa16ea421c2d4573d4ac21 SHA-1: 78d68cd66c5087b9d1669eaa079b62fa55037ab6 SHA-256: d5453b51c4e9bd952cd32e492513f73bfd677f9955d8b1820876f1cab896e147
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://burlingame.com/wysiwygfiles/file/79621017147.pdf In PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/puwunevem.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/milejezogukanuv.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ihr9dlbg80mmlteem05pcse0hb/88130192911.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/kl1huv6g70q10qa3lsk6s5d496/jivix.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/migugiv.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/2168802571.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/36083223410.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f7e4f2f460b7a25dddf3312d094ef2f5/kuramarujawatak.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d930d97f---26353614030.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/butijafebopikeko.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/cj17qof2ccc3c9lohg9qdtvc10/dojoxitalexorulawetofasub.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/7b6bh3l6khpue64gnqntk1v0n4/1014556979.pdfIn PDF document text
    • http://kezheng.net/Upload/file/65394994202.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9549a00c94---14231298758.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/65805198586.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/dezutumaforuzuxos.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/wojifeni.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f88c1657888---fivuvarazunusomoxokelagep.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/38069429760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=voice+over+scripts+pdfPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/wigip.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 10336 bytes
SHA-256: 468981fd96872fed15f206edcd76eee162d287d4a0b33c0c17997560174620a1
font_02_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 17340 bytes
SHA-256: 13297c36ec8b5ad45080771e4085b48b79af29c548dbbceae3d316e8af1c88b4

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