Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9fbeb40b8091771…

MALICIOUS

PDF

81.7 KB Created: 2021-06-30 21:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2a772accf46e9f9db104d31a76a64304 SHA-1: 98c47ab41f3704795a3c3e7d12ff34fd5b27db5f SHA-256: d9fbeb40b809177197236d59701e4bb9b80993e0f29f2c6ed200d75d97f94eee
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of multiple links on disposable hosting and compromised CMS uploads indicates a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad39f37035---lalezetifapomegeguma.pdf In PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/48022440985.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/37658302166.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210620222725435.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/64357538534.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/89149781826.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/serukitojegogulenebe.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/guwelokat.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/17606595054.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/fonati.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a0irjbiubs6dcvatj1a8a9gg0l/77339382008.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/92103481806.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qu99vgnrt735ml9jtie1hrif83/linulalaluroluxedunoje.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/13930907861.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/topobu.pdfIn PDF document text
    • https://latework.cz/soubory/tinozimopokitasitise.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b9a5a1eac---vufitomadilurunibego.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/hjtbssvmtbbs0bh759dclu50mn/jikafaxoxoxegixekovalek.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/6377988884.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3d281fd2---31421329380.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a3c487db---56605560949.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d49f6b8491---fexozalowezorubovuxamiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wow+classic+siphon+lifePDF 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_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10456 bytes
SHA-256: 1a8251ef3b1e8129f61cf4406d1a45d0dd0f4460406a6eea302bfec47d915961
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 17060 bytes
SHA-256: 0484e9bf9099caa857a84783d470d1e37e460729fde7a027f9c8eceda0518d78
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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