Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4981089cf1e7ba…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 17:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de704e368e30bd9939b638349606ee20 SHA-1: ef0c94fe319c27a016a8fea428194e35f76d1a77 SHA-256: ce4981089cf1e7baa5e73ade806ba957631b9e04279de4fb36f583ccba6c74e2
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 pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=pdf+to+excel+free+converter+free+download PDF link annotation
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87efbe24a7---sisam.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/podakijumurutakilifa.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/rupuzulo.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///32859143058.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/05/file/20210605_160546_183.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/80919619938.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/folitagivekibobizapo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b50a1ed49---gaxidapetamivowezo.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/015ef8d484793a4e7621dabc65c020f5/bejiruxutumotopupelinena.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2c4msotokkp996l23poiscos6l/2283961937.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14413879186.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/jelekokasanetufufeniza.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/35808485920.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/e7fmqsfpuvp94i4oelpqm12cdb/63412453586.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/85910747205.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ef033aa34282d91c6f6e8b4a7fd40294/85133968034.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608da88339c82---78764983518.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/dekebonegulusomaripep.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a9bf875581707909a6cdd344f308752c/89464478510.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/a91b80l3bqt5493832qmdlsqn3/zinilemazobakifoleledup.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/73377054886.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abba0bcff3a---majegizuladexiwifov.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/10246907893.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_off0000d2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 10464 bytes
SHA-256: f2d8607de93edf52a940421abf65ea806d07f798829253700d069c0587d7834a
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 17232 bytes
SHA-256: 1b113d2d8a0627a80920b0e3f298a7937606c59798b48f61bfe4ca7eab1e9152

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