Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7c18a265147b85…

MALICIOUS

PDF

97.7 KB Created: 2021-08-19 16:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4cbd5149537ac5fbaf44266042990c43 SHA-1: 537acfb96f0b0238672d3c49788fb71bd6cbdd73 SHA-256: ae7c18a265147b85b1113f7a4cc78f2af851b93b0a55173d65e969ac1ae36d31
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=genie+wireless+remote+programming PDF link annotation
    • http://hyundainhapkhau.net/upload/files/77136277016.pdfIn PDF document text
    • https://bayramkaracabeton.com/images/Media/files/39307796091.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/96359405035.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/11236984852.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ea82528e---vemivilerepideve.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/ripezomibolofekir.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2eb6ea24b5---nugefotebixamenezamuretid.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/31995954434.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/28767412354.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f80c17ab---vivasilenirit.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/e3c7ba61da576260582223c19f3f4211/55270929808.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/69784870583.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37c41273e---75954297115.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f0si7al6ft3b180h61qhpe8t44/46322783903.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/57819884666.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/24904174764.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/1afcdeeac35cc4bce80e511d4c0bb5f3/42357108174.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078d23e272b5---25419856605.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/88602431b388cc0f8d5296207942f3c1/lunebozesajewin.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/25484551996.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/18f745783f717d923a55959a8da1bdfe/kuvuzorebapusade.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4df695ea96---xogez.pdfIn PDF document text
    • http://gptools.net/userfiles/file/jopimizisele.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABF 17372 bytes
SHA-256: 6fd0630a805230c0b7b38b08d0dfa2739ea88b3f6e03c78725e421e30db03ee2
font_01_sfnt_off0001484c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484C 10720 bytes
SHA-256: c684414db60bab90bd9523be510214e1fe631fdb8b0982ae0a3948f3ea62bdf2
font_02_sfnt_off0001610d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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