Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfab06bdf7cd1ce…

MALICIOUS

PDF

82.5 KB Created: 2021-09-23 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 412509e4e713adbe9c33fc21a14ac9b0 SHA-1: 27d4fc179d004b6855e1d50072717446e5993a96 SHA-256: 7cfab06bdf7cd1ce440b43430ec7a181fefb99dca0d616b526c7cee1daaf7013
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and ML classifiers, and exhibits characteristics of a browser extension installation lure. It contains numerous links to external sites, many of which appear to be hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure itself is also noted as potentially compromised, with duplicate object definitions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=legends+of+monster+unreleased+apk PDF link annotation
    • http://idcla.net/upload/files/22168435028.pdfIn PDF document text
    • http://landpas.pl/upload/file/8334472328.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/15107752213.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381d186ad07---sukajapomef.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/ganadukerapatim.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/mudaxa.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/vuvuzuwafolidope.pdfIn PDF document text
    • http://www.polni.si/Images/files/95919044176.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161436a33c290b---ziravipesepizumufa.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/zubojipogunez.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88568771446.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/65153623739.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/gixonegu.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/29944306126.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/32335049202.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/wuxafogup.pdfIn PDF document text
    • http://feminella.ro/upload/fck/67830077723.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/rojuxubuzuvisef.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/65376176234.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/fuwuti.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/vaxekopenuguvodorigesa.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/bumofur.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kawijosemubawovarijusim.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/gopati.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/80096311643.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/acf3c256aaee1d485718740ad197fc81/98670546401.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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 18260 bytes
SHA-256: a1e1b4730ce8da943b9457b961bc6c6e5803fa6814ac94ab2c09efda2b9b3245
font_01_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 10900 bytes
SHA-256: 93ccdb0217fb67e10e93cc284f0d1815ea58fbcd0ae53d71acc9862a81d21fed
font_02_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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