Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d1ffb7b421b03b…

MALICIOUS

PDF

87.0 KB Created: 2021-10-05 19:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 52d84a1558484620227bbd1468012ac6 SHA-1: 6faca36a4fd7c2bba53b75e4c822895ef9a3265b SHA-256: d4d1ffb7b421b03bc60973a62ce5e4f67e5f71b48703ec6788bf1eebfc016de6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to compromised or disposable domains, suggesting an attempt to lure users to malicious websites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rh4-h1tapi-turbo.com/contents/files/80349171352.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161597ed8073ec---58910659913.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/11326872858.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/zarufuraginudofipar.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nuboxefanebozideve.pdfIn PDF document text
    • http://keacg.com/upload/files/kirojujimepeji.pdfIn PDF document text
    • http://webbuilders.com/files/file/69452293982.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c92e00e---33431644771.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/43677392624.pdfIn PDF document text
    • http://zeci.nl/im/image/59565058359.pdfIn PDF document text
    • http://riversedgefm.com/files/file/mefemifilowejodo.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/10480308292.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/gufibogogopaz.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eae7a34199---vejoxotukexizosad.pdfIn PDF document text
    • http://dasbluemchen.com/sufajeboxukataxazi.pdfIn PDF document text
    • http://otczenacts.com/media/files/91133038215.pdfIn PDF document text
    • http://rld-carbon.ru/file/96477655882.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210919_996947485087C1FE.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/74082198411.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/3977171228.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/80899985511.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f9490939---xemolatasifetopiba.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/67405107021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mind+blowing+trick+questionsPDF link annotation
    • 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_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 20024 bytes
SHA-256: 903c64c7c27aa97cada323d79ad7db2724916ca7cd7a99b4fc903c51c0c1c0fd
font_02_sfnt_off000135d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D9 10940 bytes
SHA-256: b6fe0a2d69e7cf5bd4c7c48af22abcf474c7cfbbce3fa336f198461d431e95e2