Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8606580b03dcbc…

MALICIOUS

PDF

85.1 KB Created: 2021-09-15 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 190314b8e95a2d5e778967c2405d1d46 SHA-1: 08d7e458f1a95ee237eda889ee8f26ad5d2953f3 SHA-256: 5c8606580b03dcbc31b45b4bead7c14a5daf5b63a788b3de6c6a6a622c2aed09
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, a common tactic for phishing or distributing further malware. ClamAV detection and ML classification strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs suggest a phishing or malware distribution campaign.

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 https://akilanews.com/ckfinder/userfiles/files/dezumesarutis.pdf In PDF document text
    • http://cmtdental.com/upload/ckimg/files/bisafuxatuveworelot.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nenerenedajesilijidoveb.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6137c93a8a505.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613468e767af6---57477887823.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/mezeruxakufevujotasizu.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/padesadufu.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/34155609894.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-8/20210908142136498831.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e436590d25---gubowozisibezabozunewu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/7493458759.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/54130563952.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ed3fe767ae8c4fd53428c864fd208900/xifozewekutubatobawu.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/fojefovuvatifizitup.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/8023983261.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e4fa3d38---kodovipofapu.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/49806111737.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/841d348b79cad8fe2edb1d178ccc8f93/zomevopebokukigedi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/sifapbs97gjv0lpgpi9on6mrq2/tinimasisipev.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/4964679586.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/9407250844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=find+phone+mac+address+androidPDF 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_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 10612 bytes
SHA-256: 3ade699b55315cf64a5e41d298e5ce40b4463301c81d8031f7215e6f6bbbdbde
font_01_sfnt_off000100a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B3 17620 bytes
SHA-256: 785e0c3c83e94f5e1bf3e512b78fb01f52459daa67bc27e4dc66861eee470963

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