Malicious PDF — malware analysis report

Static analysis result for SHA-256 371eb4598b57987e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-16 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7dbbfe3f205379f803a0e45c0228b589 SHA-1: 3567d9a39cee735c33cc53db5e3f1619c8b863a5 SHA-256: 371eb4598b57987ee2dcc5e4ff480c9c331e29af74ed7e57a785e63ad0e675c3
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm with SEO manipulation tactics. While no scripts were extracted, the nature of the URLs suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=best+iptv+for+firestick+june+2020 PDF link annotation
    • http://nova-auto.com/upload/18622749636.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/zuwegogobivetewavosuloj.pdfIn PDF document text
    • http://ridendo.cz/files/file/25542160954.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/63460294262.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/kikukafotajikosimoxinot.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/puwalapuwexege.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa81748c7---wafolobosivagegokubuwule.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/41536726888.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/defabuxopurejobeni.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/1026230574.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161370ca162f76---94133029449.pdfIn PDF document text
    • https://geloracinta.com/contents/files/jipexelubimefozoxafo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/80072710cd7a2348028307ee10953b8a/52449492518.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36231650158.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/99370280442.pdfIn PDF document text
    • https://ibextrail.com/editor-images/degezorame.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109010831146172.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fbf9a6675e281e2533e3ccf49034f379/83644147734.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zajip.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/rofujawopurir.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/vimubo.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/kibenumesuwakelaxefefate.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109052228183088.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/rokapurafusuzed.pdfIn PDF document text
    • https://megashina24.ru/files/files/20958555168.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_off0000f024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001083b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083B 10948 bytes
SHA-256: a9aef26c8e4e224e6304b6b787d3f8948cc7c719a4b421758a16a3d9b8333e2a
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 18140 bytes
SHA-256: 834904989491bd28115869e45cb312bc0a48c580b21c6cd94c013b32e2734a90

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