Malicious PDF — malware analysis report

Static analysis result for SHA-256 17468f3a1e98c8c7…

MALICIOUS

PDF

74.3 KB Created: 2021-09-20 00:35:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acf187802b5d7e944f831e57d325b1d3 SHA-1: 36bb3086bfa80c11d4f81ccb96301783bbf2b5e0 SHA-256: 17468f3a1e98c8c792a33711d91fcb5d27f4f4f3a40ea94750e30d5e71ba67a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The presence of embedded URLs and the overall structure suggest a phishing lure designed to bypass gateway security by encrypting the final payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=any+pdf+password+recovery PDF link annotation
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d28640f6a---fevebabemizuwo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313875ca250---20755916327.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/97222614731.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tisoz.pdfIn PDF document text
    • http://pololanna.com/user_img/files/45111872636.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ceffb73191---16037778548.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/vizasununuzuxoludesan.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/fabovimofasojijazukigabu.pdfIn PDF document text
    • http://mobil-tech.com/files/12069688504.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/visabasagadomi.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/talupevuxuraxi.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/56602329088.pdfIn PDF document text
    • https://pecsikult.hu/files/file/vinuteje.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/99689665162.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0fd7a339---32135631630.pdfIn PDF document text
    • http://momsystem.ru/public/file/torafagekifema.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/92785077427.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jijedoguzajafunarima.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210920050008.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_off0000bc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC60 18184 bytes
SHA-256: 147235f27a28e02c329863aa92bd4be81056011b79cf43866a875513920e495f
font_01_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 10624 bytes
SHA-256: 880fa0fc3fcb94c985c6b924bc9f3fb81252918ec6e118f8d70e2f2d7f5e11c3
font_02_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1