Malicious PDF — malware analysis report

Static analysis result for SHA-256 65810b280a1b990a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 13:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0dfe9b4d0c7e17ee6a94bd6ca3a0f1b SHA-1: 849970d61dcb1d0fd7493b33bfacbd84171345a7 SHA-256: 65810b280a1b990a08cc2e29753a42ee4831fe376f0db840bb199bd9062e59ad
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload storage. The presence of a visual download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=can+i+change+my+android+version PDF link annotation
    • https://tsolisp.com/files/file/99837012459.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/rusoxevobenolem.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sejilar.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/munevi.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vewur.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/1091723229.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916123805329419.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210911_7DF2E52CEBEC724C.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/vusozilutusol.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/25190932034.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/mipeboxuto.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e140f5372e---rujidosimagujeda.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/mofolerewubedi.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/rorukalidepam.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bj71t9l5ke80vc30ifogqo1n1o/31150736083.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/vozanuxiworuvopod.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/14890840648.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/juturuwululizugode.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6a881f36375a55e64e90d6ca33519f1b/fuwibuwenesuvapakafetur.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/basonizej.pdfIn PDF document text
    • http://hak-al.com/resimler/files/nalutivolopelamibuz.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/mezewasu.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/79544355942.pdfIn PDF document text
    • http://jainfarms.com/uploads/devurojijo.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vutexadu.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 17820 bytes
SHA-256: 883a40a80bf4912656ca926a252ef9ee702eec3f4b10ebc373f7e2326e931666
font_01_sfnt_off00010071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10071 10884 bytes
SHA-256: a50a8091de5a8deaadcac9f5eada7f0e38330b6f70a585795c752a4b957af850
font_02_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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