Malicious PDF — malware analysis report

Static analysis result for SHA-256 70547d59a884c7c6…

MALICIOUS

PDF

86.2 KB Created: 2021-07-21 12:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59a90861a9dc96da8b88008331540e3f SHA-1: 161150c5c2f7eacf072fa7d6d8d98ff7b7534f20 SHA-256: 70547d59a884c7c621afb490f1e26d82fa1a0e5e25590ba24e2f226253d7030c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique often seen in spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.peretprod.ro/content-images/file/65397105262.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/cntr3b6co65p27tvvudhvdc0da/36856523720.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c20e2964f5f491c6c8b6a9036557fafa/fipagizameworipipakunaw.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a943b94e4---gavozasasimutem.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/h3q6s2iit88b3qm80k3kv5bcd7/sovixaloru.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/35201872083.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/situtuveli.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ckm12ondmd4gt1fdf7st7j3fu0/13134734029.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/08a79663c716b11a2c8d4fc52a740fba/42011161271.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/da1877deae482bbeee02efa5f7122e52/ruvixomuluzovubowevox.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d421fad927167da31e96c8f3be211af7/16048981035.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/17d1b3b066b7a9aa6951c901652fc0bf/25581652735.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16098483da3f1b---15946262574.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/navujotupukesawez.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b38637b8---57651645992.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0708d5bb5---88179531365.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609324d983d86---kidaji.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/japirejupotak.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/22566984453.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3f9ce0c0---kemupovofepobefoti.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/gadogezepevikidixibemowud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cooking+bratwurst+in+ovenPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/posepewaxibelazanupomuluk.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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10752 bytes
SHA-256: 3261a296c1d0373db52059eb16e058177e466b38036e058b155a5b7d9f1e3e32
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 16692 bytes
SHA-256: f1efd4aaf5ce123e4f89795ffb8e5e73e1297e6d865e090c413c8cf047560ebb

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