Malicious PDF — malware analysis report

Static analysis result for SHA-256 879d59fc6cf0935d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 10:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e6547a2e6d4330219a894e3762ea769 SHA-1: 608ecb3a15765b41f2c9cbfee9d32522ba1696ec SHA-256: 879d59fc6cf0935dfa50f68f6f1be3647c4277c7ccaa93a48025c6aa13f703b3
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=2ds+emulator+android+apk PDF link annotation
    • https://ietc-oman.com/userfiles/files/63269778593.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/zimelo.pdfIn PDF document text
    • https://mackbeks.com/files/file/nosaboguzu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/gapuz.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/retetuvuwim.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161313a5710590---rokewifezopabomiwekalano.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/vusifagefijonufifur.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109091612063199.pdfIn PDF document text
    • http://dominant.name/userfiles/file/87461749116.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/xuwuvikomonotafuwezaja.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/6206114285.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/31536114975.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/418f364a2584b975d00a75352d94f68e/30740641279.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/difubot.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/96762632833.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e8cb30cd2e5ce87768d70cc97047119c/10756193892.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/pafuvivune.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090408170755.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vewaferetebevepasozon.pdfIn PDF document text
    • http://carszana.com/image/upload/File/murezekosasezufo.pdfIn PDF document text
    • http://domosplast.hu/files/file/dobufebuzule.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/3980578455.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/33147791913.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/vewilezino.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/woxibozop.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_off0000bb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A6 10768 bytes
SHA-256: ad089e737b5baa75ff62f3f80949e159608016f744c53ba19c1c228339844700
font_02_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 16756 bytes
SHA-256: 5a5ae62967ea856c05b47ac2c34379bbe5512155525d8ee66e3d5504f4e39025

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