Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b592fdc3870a0f2…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 18:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 57018486d58d13eed8e87adda0550284 SHA-1: d82f1c6e5196cedb1f9da3513fbd5bb1ad90be2b SHA-256: 1b592fdc3870a0f26c80faf478b41e37084b4f463bb26061c01b173804f4db3d
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML detection and a ClamAV signature for a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a raw IP address further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/278ba4c1cdb8086b7be3ac52d56bad32/26673226732.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6c57e476---wisosamuwotukoxobe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf8d084f1---luvakipenukidizetanebo.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/11955911436.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/segajuxajowabunodekev.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/83388683171.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxazomunavesasuxi.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/kadukasaxuziji.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/sunekafefixusare.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/salina.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/28232879643.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/37481183594.pdfIn PDF document text
    • http://dfanchem.com/upload/files/32373377295.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/50800822139.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/92951294269.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wakizawefolilewiduteter.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/1593299210.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/99547476300.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090506153573499.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/rezawiwufo.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zipexumuza.pdfPDF link annotation
    • http://bestapp4u.com/admin/uploadedfiles/file/runupozi.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/29369241274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+tamil+movies+hd+onlinePDF 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_off0000b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 10596 bytes
SHA-256: e0340c37e9e14d7e8a692d9b1001a1a3665f691f29a059b55617d156effe7982
font_02_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 16836 bytes
SHA-256: 2775123feff65f48573b31707489ec2ffd25e61eebf327a30c02eb8903ee3981