Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0f27539022c933…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 19:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f7d9065f6fb7f73e43e3bc32eb36fda SHA-1: 02f15cd944375a555ee5f4c5ed8cdf8dc5ec3bc8 SHA-256: 0c0f27539022c93388e3b41fa374c14d7eec5231fdc54dad3ec00cf3b23fe1ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://chcial.ru/uplcv?utm_term=polygon+interior+angles+worksheet+pdf PDF link annotation
    • http://citra.cl/userfiles/file/madukugup.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/p9pl85bbntcmt58m3gm62bsekm/gemisezibete.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d424938878bbdd39aa93576585c7ea0e/32393371532.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5129c1804---wixowitapoboke.pdfIn PDF document text
    • https://pellevah.com/upload/files/53852863333.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/kh8ojtvadqafa31f8o8vbocr96/luvokupiguxebopudi.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/zalemujavur.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b3a139e24af5ce2dea50dbb372688c33/dipiruverovibidilegof.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/28700157275.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/majebepop.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/rowuzaw.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e754e374d9---43214650892.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475b581ebf---kigidizipojakozozup.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/bimup.pdfIn PDF document text
    • https://iohrp.org/f_files/files/lugezodugolamop.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c5f95e1fcbaee47bd0c84c66e11a0c25/73459905484.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/93337165759.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/6389679955.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c477c20f4a---lizofimezegemajidizobuluk.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/70808718296.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ffe9efe3d---vuxumozogagamanijovawaz.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/16668757693.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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 11072 bytes
SHA-256: a37c9b8a10dae9e9342dc5c42a46ed7d1e21f8867a0724041a085005b0c13cb1
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 18056 bytes
SHA-256: 22a264b7890c6f3596da9e7db0706f511b040bf7b95aaa0ba9cefc2481a85fdb
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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