Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1c27df28201658…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 18:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f24cf287a644e8ee190013cce17eacff SHA-1: f2d2543e227844743646287c41898c641e6b3564 SHA-256: cb1c27df28201658f65b2c41ed084484781aaeea7b8f599837abe5475f41e290
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fotobolfestmeny.hu/mvc/userfiles/file/togegepivobutuvokilop.pdf In PDF document text
    • https://matharu.ae/userfiles/file/25291894462.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/donekovevoremu.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/994910019.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/vewowufiko.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dapidolirodemuvutavumimi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/16556287659.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/40759204824.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/mudegalakevegejo.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/83210641049.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/wetamewukigapirunajuzubut.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/zabita.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/pawugogupumepexesizepolu.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/vezaruxibifonexokasi.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/saduxom.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/dazaneniwujilovajanob.pdfIn PDF document text
    • https://dacola.com/upload/files/61709700435.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161422413b73d1---11388420301.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa132d9fa2---42398519068.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/firanelesoletu.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/5458085644.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/dusowokebiwomibu.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/34257591182.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vukofuki.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/45a1b3e6826aa5e10f6eebd4e706d8d3/govedovulupupupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+wwe+2k21+ppssppPDF 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_off0000b32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32B 10444 bytes
SHA-256: 5111d53ca1e0b7cd0bc28b19484e727f87c1f6fbe249ec9d22381b6cbb22fdfc
font_01_sfnt_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 14548 bytes
SHA-256: aeca0a7c72158b078d56dbd285d0757b96a238c1323c7c7bba59dbecfe65ed4d
font_02_sfnt_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1