Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2b7e7c9b797168…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 06:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7ccd19dacd1d9bc54c88f4ba31022b0 SHA-1: 5fc7cf5269927852b1936f2346a9aa5cf16b6e87 SHA-256: 6a2b7e7c9b7971686aa4b6af92c1081915824cb7f8322d27a52969017378ace9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a link farm intended to distribute further malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://directorvincentchow.com/fck_filemanager_upload/file/pubufij.pdf In PDF document text
    • http://0048.pl/48files/file/nujipezesixi.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/dumexuferogiluvananige.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/kozamijupoteru.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/dajibemetumigako.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/3762255863.pdfIn PDF document text
    • http://wawa757.com/uploads/files/97838287547.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/84302613970.pdfIn PDF document text
    • http://teresachild.com/upload/files/78807648393.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/27d132b640c06aa307bd80abe75ef98c/raxasuvuk.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134169fe590d---zuxis.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b6a7eebd---vojasavopibi.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/lozikegev.pdfIn PDF document text
    • https://mar3ol.com/Files/files/zadogupixivoketelifenav.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/55569860950.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/98292942356.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/41915161004.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/8410541568.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/43826266499.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/wukimexopomu.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/23362270102.pdfIn PDF document text
    • https://italvaping.com/file/daxiwuzeviniwejopelotes.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/siwogobire.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/25871496342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=come+tradurre+un+pdf+con+androidPDF 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_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 10700 bytes
SHA-256: 09af4dad39d36bbdc961b8054c8d17d6e706aa894b1223d1797eee1373301267
font_01_sfnt_off0000ecc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC9 17128 bytes
SHA-256: 81c8008912ac612b1df43cd036209b0a9d01993d9ed24ba525b4ee958a8ee4e9
font_02_sfnt_off00011955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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