Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ecf55f6447ff12…

MALICIOUS

PDF

77.7 KB Created: 2021-09-04 10:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 668aee9456e513c343fc70fe4eaac2d7 SHA-1: 9bc45202b6c9ea66a77bb8aba83cd8ca8a3e489a SHA-256: f1ecf55f6447ff122bccc6d7cd9e53ee76eb201fb44575514517d8d5bd0e8157
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b1faff4b4d2e21d1706c5cb7464a5db7/87961520661.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mkg71i62avj4ff199djr16o391/larunixudosexirusirepix.pdfIn PDF document text
    • https://activepymes.com/pub/file/75310098448.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/negitoro.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210621185700_56g8bo.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/vuxiverogixoledamutur.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/mubikakamitilakuxo.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/1908194823.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/50d6a04e4b11bb6abf04da0dc8386cc8/sivajo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-23/20210523220126105297.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/63393136958.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gcfda8jadmdrb5o0iive4ujp9r/13827434917.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/50967828381.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/72387421734.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/sekasedabofojodutofod.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd460cff8---9886504864.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210802205624_ns5osr.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/57892558205.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/74783148419.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/tomabirin.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/minokazubadukivotod.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110b5e6b7a2a---fifowirojafinovub.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/88556614288.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091653b95e3c---nojixufitepabepikura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=asa+flight+planning+sheet+pdfPDF 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_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 10536 bytes
SHA-256: b40d1e20e07ef04566cb683c15ac9a448a8ee18c9584aac9b19f9b9b88c01d76
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 18732 bytes
SHA-256: 41734cdcb59a0414159c74c51ab26db1f3f65b1035f817fb8faa9ade4c4ac5d8
font_02_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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