Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc59ad6d9013fed…

MALICIOUS

PDF

95.6 KB Created: 2021-09-14 07:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bb55d79d70ee358bb089ea8dd9634c1a SHA-1: 26ae4b2006e3233a4b043aaeae53d392fd68b881 SHA-256: dfc59ad6d9013fed5dbbcfbc980e2b5f89d0d54d50e2330aa9c4f86017cfbb79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm that directs users to multiple external websites, some hosted on compromised WordPress installations and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://fotocaroli.it/userfiles/files/noguwosexuzewarebajawumam.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/riferoxa.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f44ad0338120d1b86b1ef95be5f36320/fosuve.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091122331139.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/83967598663.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sojinewuvokerupofajoja.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/23741986389.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22760100494.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb46c343ac---fukeganewajerodev.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/jusefojigabadokok.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/pekifodesuxefowem.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lelapabotojuxot.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/dakajetuvekokovuzorito.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/varutovuzanezali.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f2a5dbf762bb659f423b34bcafb7bf67/vusojivobarevatex.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161354a851e25f---26875811142.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/mawenujamebe.pdfIn PDF document text
    • http://asja.ua/userfiles/file/nigikeguwo.pdfIn PDF document text
    • http://hydrem.ru/images/file/dogapite.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8504562c---26728035121.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/gojaveva.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/42981341410.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/mupikopufebuvuzodajaz.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/pazejavaruruketop.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ratafabivow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+app+development+in+delhiPDF 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_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 18508 bytes
SHA-256: 2244b027894acb9e2a2ca9faaee75bdc6e993dbafaf16d439d6decf10c4fce98
font_01_sfnt_off00014071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14071 10536 bytes
SHA-256: d4e6989365b9e41af9e6db93535b81b4b223e7fa682acc337023c84a00e285da
font_02_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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