Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64341efe0ce83dd…

MALICIOUS

PDF

100.7 KB Created: 2021-09-04 01:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5c9fc94ee49c7aa498b5b58df267cebc SHA-1: d0baee2f8e4d2e894301876152262900e65f8077 SHA-256: a64341efe0ce83dd5413d65e49407cf6c44cfb3bc1b17b42c93cd0e4623dda97
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with techniques used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://supermagnum-bg.com/userfiles/file/bodigivudenofik.pdf In PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/15297194771.pdfIn PDF document text
    • http://aquatherm-graz.at/files/45335933178.pdfIn PDF document text
    • http://winso.tw/userfiles/file/37926990166.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/21848580237.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/sijodinofi.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/bonilu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/i5ldcd8q51haiq75mcamrnr5t4/xularididetug.pdfIn PDF document text
    • http://fxmeat.com/upload/file/023a512a5c35f885a29867e5dac48e28.pdfIn PDF document text
    • http://grodgolf.com/clients/f/fd/fd83fa7079552abb47853a85229f74c1/File/zokomagizalebawa.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/mvfgi3v8io0gh8sq8o0nu1ifmm/53978061199.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f050b02c693---sijemimonanudelutepafami.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fizijanadojejezokuxa.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/14049074168.pdfIn PDF document text
    • https://fong-cai.com/upload/files/75424818240.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/15934927814.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079302556954---jikemepi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d86b2c8f6---telekufomudirinumaku.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b7e0724de---dosuvojibej.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ebb670a1b---rajimodoweborutedun.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/vilizakojeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=applied+physics+1+for+polytechnic+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8cbdf1fec801acee360eb7e1df871064/70425946549.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_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 19672 bytes
SHA-256: 951b0696323a06f8ffdbb9891c3a24f9bb0a2bb5b0acfe2d4925fa6451b1e5cb
font_02_sfnt_off00016cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC3 10704 bytes
SHA-256: 8f729318d6feddb4964d6042360272d2b7ee35168db0d221b460928c7bee4b03

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