Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05f461c4461172b…

MALICIOUS

PDF

75.4 KB Created: 2021-10-12 18:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 233536d5f7bc0b7ac83ac72b71f78daa SHA-1: b5433e68e39c8c8e7d061308722321196259d51e SHA-256: a05f461c4461172bdba526a4615584afb8efd8de1aba8dc2a4bfc83425f489a3
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to various domains, many of which appear to be disposable or compromised hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://csc0851.com/userfiles/file/20210928024353_fkv3wn.pdf In PDF document text
    • https://demircanticaret.com/userfiles/file/70785004559.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/2318748066138c7b6ac03c.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/34020308702.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/23030026275.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81205682619.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1phi3tno2g444cefkib7ejfjpj/tedij.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613db06f3a1c8---dimadili.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/26285384780.pdfIn PDF document text
    • http://18554080.com/userfiles/file/30449431435.pdfIn PDF document text
    • http://ttc-investco.com/img/files/21608406370.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/wisujedeniwimolunono.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xupovogarudalolujerenen.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/zorikanuragekif.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021092906185273499.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/jebibo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ul1r60a98t7c937i4hgfin9p03/97281893076.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/mojobipiwadazalanoture.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/xorilata.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b5ac08fb---55287340784.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/11527565907.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/84408313890.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47992636610.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/7xhmvLXWVJc/uplcv?utm_term=bromine+chlorine+and+fluorine+are+examples+ofPDF 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_off0000c286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 11040 bytes
SHA-256: 74ae1507919e7b47175079d511a83c7da2f2eed14ac3b6c4a5608c78f107b2a3
font_01_sfnt_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 17236 bytes
SHA-256: 39a1a0e669f188c095a38db5656ab8201ffa4c16f520e9659713024e09d07dd7