Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a478f2723686b2…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 10:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16e2ca3b811b0aa4e02eb4cc5b48bc88 SHA-1: 21afcb2d766548c9de8f45b0abb3f6df3ac25f09 SHA-256: 91a478f2723686b218532d08f8ba250cc9d9863fd44c8052eb5e17a88021d588
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, several of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a link farm hosted on compromised WordPress upload storage, suggesting an attempt to disguise malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pomocnaukowa.net/Upload/file/43498991226.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/69956427149.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/tinagag.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/29661485898.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/19976708529.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aeb5f695e3---22040253216.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/lokozadokukobafagulunujo.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/39336915735.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e9b3021d---bowaluwagimuvorasaf.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/tabigusutejubomilexazal.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/33091906580.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/33839185516.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/ximerajewinajijamebodarem.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/50687912923.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3977e202a253764cbff5a7f043669294/95865519712.pdfIn PDF document text
    • http://flomojapan.com/upload/files/85681774480.pdfIn PDF document text
    • http://effektfilm.de/files/file/14621688289.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/56498362471.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53883533682.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tosugoz.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/pusolazutodopazuk.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/razijeperifujan.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/xizufitofepiliwisudo.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/bebizumugo.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090720030594.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/posipaputatiwimojuze.pdfIn PDF document text
    • http://thietkevang.com/upload/files/31279361135.pdfIn PDF document text
    • https://polaria.cz/images/file/9313607091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=transport+layer+in+computer+networkPDF 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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 16612 bytes
SHA-256: de9535b43deeff602581032c756978d2d723b140d1168889c5da4e0ef6d7b1c9
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B0 10888 bytes
SHA-256: d709a15d6a24508f404b7eaeb4b90b1a8e478d960861fad4e3ee8ae3ee65435b

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