Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f22ce6c9644968b…

MALICIOUS

PDF

90.1 KB Created: 2021-09-01 05:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42224994107c6e04c7798a6c5c360497 SHA-1: 63102aa067d31bcdf8e27720cf952477f4409afe SHA-256: 6f22ce6c9644968ba16a263836b6c7cf5e29cfe5842718d2f9f53455db3fd391
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to one of the numerous extracted URLs, such as 'https://pistant.ru/uplcv?utm_term=practical+unit+testing+with+junit+and+mockito+pdf', to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://pistant.ru/uplcv?utm_term=practical+unit+testing+with+junit+and+mockito+pdf PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6dd6ec70e---nofeselodubagokupu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/13869590465.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8df7d2d289ad50e95bff742d11c9466c/zawobabux.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/55241637101.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/38afb312065207c82d0690b79020f600/mapasetejobosepor.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/novujegogopafadawe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6a45c2d6---8599132183.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/6b145628ae6975b4c0582474c5d0adef/mimimirefufu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b45bf5a37a3818aadc31f90600367be3/67804343833.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/20140160475.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-3/20210703072836670953.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09a9f3968---vujasegukajonenokafin.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/foguvaratoxopofexajutala.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210719/file/16267312607695.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vibokoxegu.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/xoderuxu.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/femapula.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pejidoxizikuwetalax.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/gefosezapovogukozukapave.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/rb2o86l6osoumnrdvgk10vr1l3/toboranafawafofotokepawug.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073e65e1c287---dowovoduwe.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/13049141254.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a871062b1ee---zugifepirezoviliso.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/h6odb7514f1qnvb7g7961s48qu/17006997087.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/9624af92f269d2d77a524b92203d338a/78017538522.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rfa9qah6ncoh3qc0bd0rqllhh9/wuvurowuli.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_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 18536 bytes
SHA-256: 6f43763237a468ed9cd59d88cb9ac50b2f5a3115848b8173bd66b9e8f2474dbd
font_01_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 11476 bytes
SHA-256: cb5fa65ae4974fbdb4aa68d91211ad5310c9dd19e48f4e70730808fdaafff2ef
font_02_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.