Malicious PDF — malware analysis report

Static analysis result for SHA-256 7784474c800e108a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 03:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 154907c8ba3c42aac76cdfeb4f2035ef SHA-1: a98d4189a373b89f6b7e640efb38c4bc6882e452 SHA-256: 7784474c800e108a5d2d3f4e740528a77ae6300fa8696a9985b1c439593aa2d4
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://quangtriasianwindow.com/uploads/image/files/20577898862.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453379bffb6---29184808271.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210913050929.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/60921640014.pdfIn PDF document text
    • https://manenshop.com/upload/files/lalijikifigupegarus.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/milubogowo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613503e326ff0---zixulifiriwigevul.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/91658845179.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/faqce0aefgp1kjt8l2o5gqplio/97542325034.pdfIn PDF document text
    • http://neteyes.eu/editor_up/62444750643.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/98368489664.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/91573446317.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210918_B80A9F6F00ED826F.pdfIn PDF document text
    • http://uhorder.com/upload/files/74462135584.pdfIn PDF document text
    • http://besteva.com/upload/files/relutekikutuloduwesalota.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/vpb2i6e0usd73p89q7du1spjg4/xofevi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/1754267674.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351b684c63f---32746143611.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/4362060634.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/76581144728.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/loxazejegupoxasogut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adb+flash+imgPDF 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_off0000d74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74D 17312 bytes
SHA-256: a4cb2796a64f2336372a6d814e65378fff60d634eb3e0edfb96865cab4e6de4b
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10368 bytes
SHA-256: d8a99034151a6d662f92679923cd3324961e8001bc24b1f260c875fbf9cdce8f
font_02_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1