Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc8a2f7d33f356c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 18:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6303c190e42e6fea33723051ddaab044 SHA-1: 6334609968d2d783623c2a90aae937b3c407cf87 SHA-256: ddc8a2f7d33f356c5666d374d6436c82eca61237935ab87fad4defccf5039a72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely to facilitate malware distribution. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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 https://smidgel.ru/uplcv?utm_term=birdsong+ringtones+for+android PDF link annotation
    • http://homeshopeez.com/uploaded_files/userfiles/files/kapanamalazofeb.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/6884839197.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/21786078845.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/82701120195.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/99516049612.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303c23314a7---digojumevabutowizum.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/50940422044.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/zuxuzojulijagopa.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/xaxol.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ee12018adbca2ec8863f73c68661f151/mabax.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161369225147ea---94613395874.pdfIn PDF document text
    • https://ottopianos.nl/files/1705333830.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/136085176.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zuliwetoze.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://www.vegagastro.pl/upload/file/91304127663.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/33459278485.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/nofimatenud.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/jamamepaxiwigudanogazokez.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/86084267884.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/27443115913.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/xufesalemanuwasuvivodeg.pdfIn PDF document text
    • http://redactron.com/userfiles/file/35018377437.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zudeleragopapumotasa.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 17128 bytes
SHA-256: b17aea8590598da5a8485000d2e9a29fc86d4dbcb7b97a7e71bf235242730390
font_01_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 10536 bytes
SHA-256: 027d827d4e8683292829db30424756333fa1a5236ae658441ec5cd55dc1de3a3

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