Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8661c2bbeba04c…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 11:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bceeeea937c32041a68e9d2e8c979cd SHA-1: 9555cf08e9f78c34dbcfa45157486390dfabb43c SHA-256: df8661c2bbeba04c6e39b18420103d7401a93a51f5121ba202b12bc797673a37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://studiecarriere.it/uploads/file/57415696919.pdf In PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/lisugatunixezu.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/6187182437.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d3a05fe0---sogejiw.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0911bcada---62329223616.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834963ddf3b---91920364130.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/fabowur.pdfIn PDF document text
    • http://stonebreaker.at/dazomul.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53af574975---wipinatazo.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/71c5f22c9d44a2c93d90c4017471f500/vidirutire.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/pobavutobovumu.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/33583231892.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/62048490349.pdfIn PDF document text
    • http://wsm.hk/images/files/wimifokibazi.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/58911913891.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/14863742791.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/5637a6d1be688ccfbe4f81d5093bf131/ropudiwosegegiwojuv.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebdd1092e3---laruroge.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076c699e94---48402122646.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zekadivefe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e56a2ea749c25f13fa041c292f247ffd/latetojutefotajavumitul.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/56565295261.pdfIn PDF document text
    • https://avflash.nl/upload/files/35545378754.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc36f7418da---78179275474.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/56b02bf3265a827cadf65e03be384c3e/32915995694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=chess+rules+checkmate+pdfPDF 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

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_off0000ce5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 16768 bytes
SHA-256: 25ca46ebc85fa621fe1dafa6a532b0934213c2c8b29340b4c5cd952788e22c10
font_02_sfnt_off00011154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11154 10792 bytes
SHA-256: 6f771ec807ef439ce164def57ba1472b015d468c2ff4ced591e389412ac64d9a

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