Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b82cc5c0fa7000…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 13:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f378c2209f1e3d829524e35a344ec563 SHA-1: b9f79c72a56dd35126a16fa3881487230ca7b6ef SHA-256: b5b82cc5c0fa7000de2e1a1797f1d4012bec96f84887bff7b1bd2dd058d359e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://sistemkabin.com/ckfinder/userfiles/files/65387127205.pdf In PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/64635039168.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/50674495023.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/37751313584.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/movetolugemujepewowo.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/99317465561.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41ad7e5f1---34144769572.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/46318105147.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/kojufukugoloxudelanadete.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/69688959707.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/8524547250.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/36628439479.pdfIn PDF document text
    • https://e-room.co/userfiles/file/gobefewamumanuxizo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/tedizowixorawegodokoxak.pdfIn PDF document text
    • https://domilot.com/uploader/files/mozimaxuwaz.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fd4a51a2---nuxadesakotosaguladipas.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/rovowimi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/lisoturenubozebizak.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/56682196864.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163062402771067832024.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/f024b8b7a5c814dd5e6c33322d2b6d55/79011842828.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/76375484754.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/49865338548.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/sijus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=game+obb+offlinePDF 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_off0000b1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F2 10188 bytes
SHA-256: bc9c042242a0663b36785342db3f76265fb4893329b0d44c1fae09c3346a5f1d
font_01_sfnt_off0000c8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AD 15952 bytes
SHA-256: c342453f4be05220ebdb14c63ccc50115ab45a874580615bda63c4594ca2ab34
font_02_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1