Malicious PDF — malware analysis report

Static analysis result for SHA-256 96239afea5ea6e72…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 02:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5558a9f704abc177bf8139761a5f8516 SHA-1: 41cd66622325ea8ad34fefa287613d4353158e35 SHA-256: 96239afea5ea6e72757ac5a19e3e4480820f3d9303b995da342b5e9e4759bf07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, pointing to multiple unknown URLs. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/44673d8ceef56a04cd6a494d7933c9f5/75249369474.pdf In PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/wogemufesilesudareduzo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7abc67a0d---nenaxurotevosufaz.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7084f0853---17373035849.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608147176f3b3---21803641752.pdfIn PDF document text
    • http://sgpeo.pl/users//file/nalomekokimu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0pgsntdqo7a2ao56faj27ogkmo/gitizuvozofinov.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/51241757252.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/50197c0a3a16cd319fb1168ad74d7ef2/69677671183.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rabawefopijivimipika.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210824_190056.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/d1tblvd9sr2498la5q7n3bhcg5/jaseruriwovigidoxovow.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/92801208215.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/23692727989.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ha0uq3dj39brglq8ieh4g4f591/tuzopupud.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/61952374251.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/foruboruzubepemesixedi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0146746c4926815f60319187b0ad86c6/dupes.pdfIn PDF document text
    • https://afayl.com/userfiles/file/78797055981.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2mfe19o3shpi5bb14c3t5vfao8/11286149953.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/4685274466.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b7758867f9bebd3f685c2bc5189b7363/86151040214.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/52941559318.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/nizizukux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=fx-82ms+calculator+manualPDF 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_off0000b7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CC 10708 bytes
SHA-256: adb8aaef82ff090fe183b7617f7fe9ea9b775e8ddcb9e2fcf5b291db7441fc17
font_01_sfnt_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 15644 bytes
SHA-256: 7033b00fce84056ebd64f89b1aae096c13987cbbde2f0757be169b22318951e8

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