Malicious PDF — malware analysis report

Static analysis result for SHA-256 29fc9a8d918781dd…

MALICIOUS

PDF

77.3 KB Created: 2021-09-14 14:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba3691c651e03732b4f4d5b9325bdcf9 SHA-1: c694124edc51513d5cbf27743e6b1816165186ea SHA-256: 29fc9a8d918781ddce2eb3e21f08c4a7d3018d387f8508102214b8e5144a5f5f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics and the compromised CMS upload link farm heuristic support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://villaelen.it/userfiles/files/38302976395.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210910_3BD7960992F9B892.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613961580d913.pdfIn PDF document text
    • http://siddharpeedam.org/userfiles/file/In PDF document text
    • http://landpas.pl/upload/file/gurirarosevorizebefokuzox.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/7797036177.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/butuzotipawagevesezojona.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd39745503---dadodewemupotolul.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/dozuki.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/gegulugolik.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kikidolisutu.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161353f235f178---57113414928.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/31977661479.pdfIn PDF document text
    • http://videlec.be/ressource/file/suguvovurizolidafox.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f12eda3a94---14912205387.pdfIn PDF document text
    • http://profstil.az/userfiles/file/68941370602.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/luvuw.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb2635de2---34523023866.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/85507273103.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • https://ms1oke.com/contents/files/rexiwobuvup.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210907134920643.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/nikelawepugunavosulameg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+freenet+apkPDF 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_off0000cb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1A 17392 bytes
SHA-256: 8bdf1efb772bcdbb1ae712426814ed0221006794d12eebcdbf9c70b79bb7889b
font_01_sfnt_off0000f804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 10408 bytes
SHA-256: 7702a5257c52e8245ed90808f70660152c1aaa1179f423bde5ec3607b68dd7a0

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