Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3571c9878e1ae67…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d03e768981753e59fd562a16abba43e0 SHA-1: 6a7c2563da9018b8e0723317eb458274b41bbfbc SHA-256: c3571c9878e1ae67698c42286efe4d3f4ba20a9af99cf5ade1399f684141b7c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=your+best+life+now+joel+osteen+pdf+download PDF link annotation
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/nabamisazet.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20f75b0b---80578235714.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab8c5c0c55---bogavabixuge.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/92361231054.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210828_41178E2DADEA0445.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/bitofifajuvinuligemivak.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfaa94f7d5---92841278576.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f485ca81aa---86839678581.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/26888413811.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/46569118732.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d6bb51ee3---60717473718.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/276a373ec732b5a0823a546e6e3b6085/94791466625.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/velefifozafegibon.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/maxabobo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/62857555472.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/mewunazonupuwigoxef.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/dajekinibogaka.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/mozupubar.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/515fb51aca8ef077311108217ca62de3/50510147897.pdfIn PDF document text
    • https://pmms-online.com/assets/file/kavolopevolawa.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/06f1092beea88b0a6a3c4468af66dc67/99255009705.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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 18672 bytes
SHA-256: b3b24d10a0335a72f9e64719855fd1fcdadb00ffea6396270c3c633562de41b9
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 10928 bytes
SHA-256: 44ee4dde0515dd5a3245f96fe5154fccd35afccf71d4fc8f46210051f637c7d1
font_02_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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