Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dfd86f6a12c4a22…

MALICIOUS

PDF

118.4 KB Created: 2021-07-06 21:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8a97a6b231e78a93ef5aebe5a74af84f SHA-1: 14ef885f5743120db73fc6787df8da0c89b0249d SHA-256: 2dfd86f6a12c4a22b6d95a9c336db55cb68bb04b9e1928744527e62e59b831bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This structure is commonly used to distribute phishing content or further malware stages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c96a6bae3c---89072590672.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/18bc8df235b60b6375c80f7f4f3271d3/petegijasepodelibowaxosak.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/06d8d7d1a64ac743d5351c87761cd847/41556428931.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088723c84cca---83709293642.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/tujowotuser.pdfIn PDF document text
    • http://russia-ex.com/48805069930.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11736e850---zagiwubobaj.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/rijikelemus.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/404bf8a9f2ee830e7f31347ae95705dc/81551887677.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/nenafemesijefatutagono.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160991857bed63---17026369928.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/15755949512.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/e0b201102dfac1fd44557b1bb8e76838/jorororepusase.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bomewinorakalos.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f84ac6906---38980920110.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f1866ffd38e58578469d2d468c7a8335/sakifojozuvizabumis.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7jghpbpb97g4k50pak5d9d43ad/sozixe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1f1959d58---50760199415.pdfIn PDF document text
    • http://islandpointfl.com/userimages/jomuton.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/mupuresusuj.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073851f3198b---1771215418.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bff8e79d0---xanipo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f717f3cd---mimalosekofivobek.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/6bef8352800185fd565963e7d01898b8/11131408900.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c90628286---kapafi.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/pixedipirenejokifow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+the+year+2889+moviePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18688 10784 bytes
SHA-256: bd99640bb4c34ed9d48bb36345b734b283d134b1ad358cc47fdf771c31376c6c
font_02_sfnt_off00019f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F4A 17836 bytes
SHA-256: 550d0d2b8eb482ee597a2da71bfa2070058d0b23ba2789ea579ba35925ccff9c