Malicious PDF — malware analysis report

Static analysis result for SHA-256 22be8d125bebe69f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 22:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c90b3c6d5c9d2843482a2c3c2097cf4 SHA-1: 2d9b2e78e010a1545c97bd41df8dff3050796edb SHA-256: 22be8d125bebe69f659af8c7386ecced47d3b09a26865030f41dde1e43755a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external links, including one hosted on a compromised WordPress site, supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://rwd.webseo.tw/upload/files/kuzumazosaj.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/xozudolizexekupumaro.pdfIn PDF document text
    • http://deauville.ru/files/file/86532850192.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/9811380044.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/lizazixexijiwabojeduza.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/53059513639.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/beruda.pdfIn PDF document text
    • https://mavibusiness.it/file/lejil.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613175e1d4f25---22727472957.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/31714764810.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/kopipukiwadeb.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/pumowaxed.pdfIn PDF document text
    • https://alpinashop.bg/files/bigiwazuwidedojoluzesat.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/639f7f7f4e638668b7765470a77d8da6/84713380037.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613916fe7e9a0---79181376676.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce3a9c8b96---nisewabodameg.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161368ee58a05f---10834884927.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/dilipurexukusafuvo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/41431437559.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/xadiligofenosidutibeve.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/kizupur.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/46506851360.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/famijodabikitoxa.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/34696703664.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/vodenikemefuriwivopijexu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/19230683614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kingdom+hearts+union+x+mod+apkPDF 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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 11076 bytes
SHA-256: d5796d6b92dfee6894696f7e73b81ae1f3da13b72182e0e3b25323cd63e836f2
font_02_sfnt_off0000fe3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3B 18196 bytes
SHA-256: 08731800550cda84570b5a7b1de043b160f46e7ee2b87c76f677c572c10063f0