Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33b76699324a36a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 02:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b356de23b7eda5f75bd349b71cffc669 SHA-1: 14d8ce24537fef36cd5e6f9309c20fa885526c3e SHA-256: d33b76699324a36a30755fc8a2ae51dc12a52e1896fd06b993721af3f9c93cbb
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=habanera+sheet+music+pdf PDF link annotation
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/54842170145.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/48675259629.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dl8lgmq4daokd5ve1ks9f1etcq/nomuka.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/rigagizajogipitun.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/xixoduba.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096916ebd479---36943302346.pdfIn PDF document text
    • http://tahyuh.com/uploads//files/202108112351391596.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///dewadupopakebumusu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/wobali.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/nizapar.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607a46123e7c6---sosozatuwododokokag.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/vakijolosinobapabur.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p5e0e5fe4aebt9qab08rjctqhu/55445879538.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b0239c2526506a05cd3c46fb1d9c6f14/misim.pdfIn PDF document text
    • http://huiking.cn/uploads/file/130451474651.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4ad4661b85a87dbf2291e13567c4d30b/96236582784.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24293260e5---80133899478.pdfIn PDF document text
    • https://tckontrola.hr/files/zukifodevomedudinanozem.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071d40e3e5d8---95694479032.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/nidasakadalejosavorife.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/58439320638.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/59878772745.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2bbcaf9fdf2cfcabf7b04b9832fd3ebd/vivilekaniwufapifesumekar.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 10952 bytes
SHA-256: 7e3b728a02b8f19c64313001ccd52ec6d2091d4c8d1b31b075dce584118f56f6
font_02_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 17044 bytes
SHA-256: 9e231dfc5834801c44e83f98c3c0baae8eae78ea442a3d5c474f78f69022b3ae

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