Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd9bca17e052643…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2a69eb924cbb4facda6d6d16ffafc555 SHA-1: e2dc0710f2cd3c39643017cdcd0a3ab6fe00ece8 SHA-256: bfd9bca17e052643e2301362fa6408e9734dc2fed98567eb634c212b6f91cab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90308db26---15523211136.pdf In PDF document text
    • https://cgeminfos.ma/upload/file/85630884481.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zemupadupezenopoj.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/luzalomumofafuluvulew.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/rowuwukanijapezururu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/42996159571.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/26102693521.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b8e209ce---lofusenimivigowixojuderax.pdfIn PDF document text
    • http://belst.by/upload/file/53686623156.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/letifubanonigagukavajol.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/lodolibabamupezapuweze.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/83637204503.pdfIn PDF document text
    • http://ahknchem.com/upload/files/13641019107.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhladd215399slsrigs9s4r6st/wuxetanu.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/f34d9aa9c2032bf9f7b9514c874b7668/53853183164.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/807527334.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/siruwi.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/gevelirupuzewumubejolagad.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609889f4952b5---panaredixipikowuk.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/raxotufu.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/kerataviferukojujix.pdfIn PDF document text
    • http://aurora-c.jp/files/files/jodopozalovavabodono.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/buzud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=toyota+highlander+2016+user+manualPDF 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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 11336 bytes
SHA-256: 1907b69f00b613b025241a062111035e26693c3149b39773be49c8272907cd4f
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 18004 bytes
SHA-256: b5f9f91bfad25fb3d15b1b5db090ad92a7a04fc96aa96009f5cb4be287858032

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