Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb87fcd21a33604…

MALICIOUS

PDF

72.0 KB Created: 2021-09-17 01:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99402be50ceffcd7ced9d899e6b3e457 SHA-1: 58e367f5382eb48c47d13742b4449f6fda763017 SHA-256: abb87fcd21a33604401ae703c0cdb30000d8c5a029ff06967aafaea2a4bccc6a
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=pokemon+team+rocket+edition+download PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/17091252641.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109090852152732.pdfIn PDF document text
    • http://tfforming.ru/d/files/petadigida.pdfIn PDF document text
    • https://kimcert.org/E/file/tupinadugiripugeduvadoz.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/mazimo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631502585.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/wasimikonaronan.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xejikufus.pdfIn PDF document text
    • http://cartopack.be/Images/file/kefabubuv.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/mukesuralitudupa.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/13489551519.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qk800m5r0ecvrvit6c284n5ro3/17064644012.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/eb44bbaac4edff25694478393effc92f/jumakolomugesif.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xivafekugiv.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/205007826461329028a514b.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/88187544575.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/bawuzati.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d091984---lisugazaj.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/19731859191.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/68741058216.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/29611100595.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/83066284502.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/55187180406.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/62328136369.pdfIn PDF document text
    • http://medi-sen.com/files/files/94492326338.pdfIn PDF document text
    • 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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 10544 bytes
SHA-256: 68b182b5ed38d0128d284fa4757a3aaf6d188901bb6a3c205ca8cd689e200daa
font_01_sfnt_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 17500 bytes
SHA-256: 4e7cbb0879f6819681315b03fe89f8a5b8447143f36a6f78903a3147200c4757
font_02_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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