Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddc1524ac11bee9…

MALICIOUS

PDF

93.5 KB Created: 2021-08-17 21:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a2d1b19571e66e26f480bb09491953e4 SHA-1: c51ac813fc2f62d34bc039a04d3ed646b2a3ccf8 SHA-256: bddc1524ac11bee9380d31a7c952d622d301484d651d828842ad233ee84e04f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to external sites, some of which are hosted on compromised WordPress installations. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+do+breast+firming+massage PDF link annotation
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cfoaisut44arv3ltsu326n0bm1/sodipugonizetumugesub.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c465b0609---faxateviliritegax.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9af7451df6---73797740484.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/nolenagizusujak.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abc76b214---13279412565.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/0l201lhpumegoce5ajj5ffhkl6/9904145294.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/lutunux.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/79046718647.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/medagut.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d765662a---sugepozapakilu.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/a980301ee819b66012d1c299ee65f233/towoxefedolate.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/sujokudewugorudab.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/ninexik.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/46166212857.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609623011d9d1---navetafebudikotu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/712fdaa6b07e87da97dc598ea2d772a9/11752829600.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/fosotip.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/78032820389.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/14596052624.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607424fa84745---bupigilawasedimiwetemiku.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/71146522694.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/84523906684.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a39fa46f8---zoxuzatimitop.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210618_F7EC1C6F84562AF1.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_off00010af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 10868 bytes
SHA-256: d7570183a10f04b001907e42d8fdd8b742e60219180541074849d9dfe6c7358f
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 16836 bytes
SHA-256: e8792e052bdcbbae5f67719bcc1b91447768a097675bfb4163af88d6003c136a
font_02_sfnt_off00014f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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