Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dba5a7c904e4a8…

MALICIOUS

PDF

75.4 KB Created: 2021-06-16 03:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 72168ecabe5dbb5cb79e41f389b6f613 SHA-1: 3e208e6719435ba25441e90457c7d696aacdcdf0 SHA-256: c6dba5a7c904e4a8197c2117ce5c4dc4d01b118871344bf1206f5cf6fce2673f
156 Risk Score

Malware Insights

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

This PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malware or phishing content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nomylo.ru/uplcv?utm_term=merchant+of+venice+workbook+answers+class+9+icse PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/14ab2b935802ee07d0491237ddbfaef3/99629645226.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/986be684f9f5e2218a149c77b7d173ac/37023217245.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/suwegatifi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/bmit8l32s36gjf1i32e0e1l0km/56696800650.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ade454e5d---78178422806.pdfIn PDF document text
    • http://ubest.ru/images/file/fugomewapetefaneme.pdfIn PDF document text
    • http://erictex.com/ufiles/files/85342308878.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/af7c59fd205cf46a7f1043ad2959cf04/wolafel.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7272de4f7f---zakeleve.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbe287466---lanuvuvabibuzi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6e74b04f---gogumovajoziganof.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/rimerenoximap.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/t31v44688452t7ioskbkjliho0/jugod.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/38723338741.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ecf6c5365c11ac1a30e0c05ee0bb6a7/79986205559.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b69fe53945f50381d55057536d127df5/vedosudif.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f353f15c0---bavetubebuteted.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/10b8ed9c0975582a75fbd55c60ce1c58/megalimexemixovidilog.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5a03b781f50c6c347ffddd3d04c891af/28914545059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 5488 bytes
SHA-256: 93267d64eab8ff658d3448795002d21a3fa504dc69e733482155a08f7f8e81d0
font_01_sfnt_off0000ed06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED06 10356 bytes
SHA-256: e8868bab1e156c856f8bb2800a27178a7e904b86de92571053431f64383114ff
font_02_sfnt_off00011084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11084 3548 bytes
SHA-256: 5c35d9f7c3b5255eae151ebca915611cd13495db41053f677e9a15275f76f98e

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