Malicious PDF — malware analysis report

Static analysis result for SHA-256 888408c9419d50ca…

MALICIOUS

PDF

85.8 KB Created: 2021-09-09 03:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 112273a8833e95628b835ed54190d010 SHA-1: a0160c09822c97daaafdf06b2d26b57356bccc20 SHA-256: 888408c9419d50ca47dc4f36a812dfad8902fe9d6ba86e22c3febad5788a7c19
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and external URI links. The PDF contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=gladiatus+android+app PDF link annotation
    • https://paulogomeslda.com/userfiles/file/85723857391.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/refofuvemo.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/9761061741.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/57429414492.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134ba21c6471---6499345835.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613096ed7de63---91395736332.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/gepor.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/75074369268.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109031249489342.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/33756486636.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/70063541044.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/29279687496.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/72050553713.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/72355880952.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334927336b2---limotara.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/21768666219.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff6c61546b---17366290321.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/gazezegabikewufigib.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/21971614720.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bamid.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/jedejaleforir.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zoxusurakebotewis.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/35455668294.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe02a862c---rogirerosutuvefimazosej.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_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 10392 bytes
SHA-256: 10a79c0cfd5ddecfe1de34f29ac1c53ecf59b3d7aa1a828ba33e46492b402a0e
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 17180 bytes
SHA-256: f2c9acc0bf5b5e17f5f04158635da1967e4d3ebdad81861ca30acd2bc0e89db3
font_02_sfnt_off0001317e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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