Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5d7d7a5a096aa3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-14 18:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f11abef3a92ea6ecbec0b2743d8ee39e SHA-1: 46c651b1c5081a403de6859ebc3e3f41db0e55fa SHA-256: 3f5d7d7a5a096aa32063550aa7e265c9d4e6f92a630d2ad553977a91657878e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gmnavarra.es/ckeditor/files/sikokifexuliwegomuzok.pdf In PDF document text
    • http://edins.net/userData/ebizro_board/file/80714517966.pdfIn PDF document text
    • http://kustari.net/userfiles/file/82563027288.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/51517825265.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/bijakokerusovug.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/josojulajamuvoso.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/52495699250.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae237bebf---tuwin.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/tixanifirojazakubo.pdfIn PDF document text
    • http://edeins.com/userfiles/file/36928427530.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee1fc0e922---miziwatabuxirata.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gokulugirebakalozuzusali.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81918760189.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135094a2627e---56274557410.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/wezolenaloxebarir.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/12030231707.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/bokevijazet.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/21505795684.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a9ee6223---zofapigoveropezumenepure.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/72556735081.pdfIn PDF document text
    • http://kes.org/upload/editor/files/18721403131.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/tatomuwewazuremurirerig.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/15449393238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=realme+phone+manager+latest+versionPDF 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_off0000d458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6A 17460 bytes
SHA-256: 93bfd118c043a35bed8945556f30504c7f2b017f85f26d8cd17354073ae99e1b
font_02_sfnt_off000119ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 10808 bytes
SHA-256: f5bd3b58141daef3ea8c90f62da4e0ed7437a6ba2291f0bb3d7d7ac1c5ecd849