Malicious PDF — malware analysis report

Static analysis result for SHA-256 50015fbdb267bbb7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 22:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d837d3217eb5ff103d9f6e0db60a82c SHA-1: 95e946f82dce4fa162dc0870932f9115a48e8b64 SHA-256: 50015fbdb267bbb70e924d2495c49f92f7dc1aeea3c2e1ad31ea3cf44a96514f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/89dfc3b9f32a980055e9ee3ef3cc3827/jiloramen.pdf In PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/wifegepujenesigava.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/funabipomifapusewurokipo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dc510dc6f6688c663c976931df990d69/bogezesabasilenidolobas.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/oqdk6vaqe47rhq3qvjh1at2o92/60239810448.pdfIn PDF document text
    • http://c-amc.com/upload/files/wivunuzovet.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b872b9e931c---89204242818.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41113167578.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c8422d2322215f027b06724a8db956e7/kufijuxizuxavavigojej.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf821c02ee---88752748440.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f70adecf0---nixowijifujemanegobefaba.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/b93ftqeodgj33dfe86crmhqds1/laxatadizilejavovila.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df102a9e71fa2adcd4798991df7c8ea7/53863278476.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/podonidekowas.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040df6089b---vidapisujinigup.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/69151907004.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/3015780923.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/sejilitilebukezidu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/71200671679.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/supowupasuxa.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/81816671329.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xekijetikamosopefugeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=linear+equations+in+two+variables+class+10+important+questions+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FD 11452 bytes
SHA-256: 8e49987538a89663becbaf2d64d0ec08d835d512de4068102e2a3bdc47ae3104
font_01_sfnt_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 16296 bytes
SHA-256: 8568e6981036a74dcacc24635fad37544fb8bca0d0bbf2998915d7c18bbdc3c2

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