Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587a8992d98ac74…

MALICIOUS

PDF

81.0 KB Created: 2021-09-10 11:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a808126d7a707d9e880c5e0ee795c51 SHA-1: 7c0464fa4b4914b78908648034031986fbbdaecc SHA-256: b587a8992d98ac74389ff509f05adf91edf46f3dac6b33f1017c269397e0913f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=how+to+reset+moto+g6 PDF link annotation
    • http://vencedor.coop/images/admin/file/25152444835.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/62692217650.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/63127979590.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/14833745773.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/lunarinawefinalisijap.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/48776659557.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/gaseruvafebinef.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/kofekozapufenizagaw.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/65168044048.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/78893782393.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/39586470052.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gipewibipix.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/tsv4c2tqbcoucmr56qn8kebkq4/biwise.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/64857415745.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab0fd103a---puremelemi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zezodadotijeniwuputiwufe.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210904192600.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/jogudesoxabowabaj.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202193010435251.pdfIn PDF document text
    • http://aimic.com/userfiles/file/85155963056.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/69dac69779861e273c6481357a737e5a/89454799810.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/41174754750.pdfIn 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://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_off0000d8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CC 10292 bytes
SHA-256: 9aa1cec8955f181f0a02a5af620652fa455100834fa7c76c27171690003963e5
font_02_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 18344 bytes
SHA-256: ac70056618dd664928a4a12f4d7385582ce1e22ad28617c8183e46fdbbfaf2fa

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