Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda2b53782228d98…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 22:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 933613234819f4ce38ed15f53bfb0590 SHA-1: b077336d31ebc3adb6c4550f6afaa2809fa625a2 SHA-256: fda2b53782228d98a1490757d9919474a77d4fdc65631a1e3e9c87f7d0d7df38
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, several of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crownprolaw.cn/userfiles/Proj_Name/files/fibabedutupu.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea4f9e7ac8.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/bekudi.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/latikaje.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210913_319E86C56EBC06F1.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/87352869253.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/ripuniwoxekeba.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/26168140111.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/desubewalanu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/pajibumagid.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/kubedus.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/74926518693.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56e009563---pefimokinerodasixeg.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161386ae529e73---51100247451.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/87224061674.pdfIn PDF document text
    • http://webs123.com/userfiles/file/wiwepisusijixi.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81377742889.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/dositigigedodebif.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/6b2fccbb325dde78d8dfe1990f5937a8/56369815226.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/81901090494.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/54434464461.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/17703324824.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/wunilu.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/jokirodaxiburimowemeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=programming+for+the+androidPDF 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_off0000b42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 15348 bytes
SHA-256: c3e155773132314d3e6c4e2dd9bf42ea6ae29912fd7a73bce03fd972b02d9695
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 10588 bytes
SHA-256: 1d77bff80a8140391408f7de7b3a247b478f43c3af3d4524ac85bf2121b2b0da

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