Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9d6605966e2920…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 00:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c208eadba8666e2e68f78e4d980e6e0a SHA-1: 340c270c1f6993cca1fc96ea2aedf9f10fb017ce SHA-256: de9d6605966e292080bc1cd83ab3945b6d86c529f495a8f5bcb79f7af2441856
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which host further PDF files, indicating a link farm designed to distribute malicious content. The presence of a 'download button' lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malware distribution campaign. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • 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 http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/21184617480.pdf In PDF document text
    • http://gcsiva.com/files/userfiles/file/30472915558.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wabinofisuvireguseva.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/34177809489.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/gukez.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/64910095575.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/72830627494.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131bd25c4903---sofetufirupemobibexibiz.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/kowuwa.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/faxedazeko.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4f9cdbc79d4c5056d51cf63a608313a8/62960511697.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/pusidi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccd93ee2e---nutilulowidowulajupajami.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/gekomagaxupoxegovawerage.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/xewokufizudev.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/mibidex.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/11131858300.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/46501771925.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/takebewe.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/tebonujirunapivirifatut.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/12000755101.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/43390879440.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdcd11d4---94970102872.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/88816356217.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1b7d8kijsi6dkkcc3inc9clti2/tajan.pdfIn PDF document text
    • https://ebooksweb.net/files/file/tumexoninifep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=premam+tamil+movie+downloadPDF 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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 17256 bytes
SHA-256: bd67d7a12d0008152eae13471b533852202ffc5d2cf13b0c491afd7501829d3c
font_01_sfnt_off00011796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11796 10392 bytes
SHA-256: 577297c2b5e080edde48179f00ff48376b47c1ff3a7d7b3f95e35312c5e404ee
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1