Malicious PDF — malware analysis report

Static analysis result for SHA-256 0262ca63570596f2…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 14:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55349b7f90757d5e1f9dcbb55d1302c7 SHA-1: 6b78b54df6aa7be68fd0a832fbe0a3525e3722f9 SHA-256: 0262ca63570596f29fb762ae9d869ada68b8fbc75226cb94cd277dfd0b500000
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://computer-rudolstadt.de/upload/file/10636303191.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8cfde9e8ce044e246b4cb79650a5b8a7/37441839686.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/wifekobelureweduwibe.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/r8q9c8u8q2g5hd4vjetag63jnb/dulomifajodadenikewa.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/29678125795.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215146953057.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/008a626e1943860380b8760aa85d5475/juwoperefujarofemow.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/donexekonekariga.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/20804489620.pdfIn PDF document text
    • http://w-mill.jp/images/file/sogotiferoruwitaromami.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107374c7b584---99084397060.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/zogikojavuxodixovelifiru.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080622742f---gimanasiguweluvupanadop.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/31960018362.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c73b09409---84416017536.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/b8a9dcae7f62874683120c4f319598c3/gakerunanamoga.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xovisizegebit.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f7f3b7e---xuvojusotimuwezapika.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/30469400452.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/kanabik.pdfIn PDF document text
    • http://mchs67.com/clients/6/60/601da637195afcc8544498be66ee72b0/File/69245913400.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4bcd22540f---16767432115.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1c85698a9---29756427930.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210723_982D20CB38359148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=citroen+c4+grand+picasso+manual+2012PDF 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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 11360 bytes
SHA-256: 946fbdf582d210a395ef8f9fa80deca8d9d67826f46e4713d739b73810a56f81
font_01_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 18812 bytes
SHA-256: d3ede5edead3857e01440283d42e5e6d58320fbf75aa628c18e13987334bffc6
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1