Malicious PDF — malware analysis report

Static analysis result for SHA-256 67de6af6d29f9e91…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 23:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e187ab67e957c6884ca17501e7cc9c8c SHA-1: d49ba0ea46c245949fd0521f3e641f42c5a46570 SHA-256: 67de6af6d29f9e913a0fb06b921ec612d6b8051d9271fbf227117d5e6f5223d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://app0.linkeo.it/ckfinder/userfiles/files/97072339002.pdf In PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/lubodovizabasuw.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/lafivinexuzomewepebugivas.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/lojubusidozonujarido.pdfIn PDF document text
    • http://euro520.net/userfiles/file/163193175039561804.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/29406179878.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/potafixi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451a7faf35d---88962101949.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/karadenesaluzaresigaxego.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/68715026006.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4ffa78d37932a4d1dda611f5bd45435f/72675385071.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1220b0ed0f5f90805ed117177224aa0a/desoba.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jopozabibavomaxiwafeb.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/68271414213.pdfIn PDF document text
    • http://3sdent.com/upload/files/xejomuditofonero.pdfIn PDF document text
    • http://fastbeatbattlerider.saint-fun.com/assets/upload/files/21170147451.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161420280e22bc---78314928791.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61384fa10b391.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/79524924971.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/56783239834.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/4613693169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=no+limit+drag+racing+unlimited+money+and+goldPDF 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_off0000d3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C7 17856 bytes
SHA-256: 923df4349fa69f9dc55261bb9e89b20ae76c0b35fe84ad0615d58214d5c0ef6c
font_01_sfnt_off000101c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C5 10736 bytes
SHA-256: c8453207ed5622e4f4b81b796e3f19457dad4354043b1d5b2c478a6af53503f5
font_02_sfnt_off00011a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1