Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92039fab2767a9c…

MALICIOUS

PDF

68.4 KB Created: 2021-09-19 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d9e016a43bbffaf43645947b365cbd3 SHA-1: 1ff28962ff6f30ac27280299906f872d89777466 SHA-256: b92039fab2767a9cc7a647c6554da1bfc4dc309d1c96e44598c8627a996248f5
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and link farms pointing to potentially compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The presence of these elements suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3855

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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=how+to+watch+blended+for+free PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161303053739ce---49161537674.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/sorogisijiresidemiratulib.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/rokukuleraxajiden.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/genuvopenofugilepazur.pdfIn PDF document text
    • http://citranco.com/users/files/misojasitavilewufu.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/dukojowosuvirurigabizit.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-8/20210908000656413820.pdfIn PDF document text
    • http://biosite.ru/images/news/file/13072529657.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kapurozomefekojarixatugo.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/71705196290.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/wobasuxojejeliwidone.pdfIn PDF document text
    • https://hoavily.com/uploads/files/63925256113.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/nazevurina.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/gotilogabo.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/21570264777.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136e22bd342f---55290106835.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://buyafranchise.org/files/files/bisirituzuxikok.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/xuxez.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16135280f240cc---tajumejezodavobe.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/zezerirejujovasipelewur.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/19657412501.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/golima.pdfIn 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_off0000b162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 10532 bytes
SHA-256: cd8358e389d97dadee9e46925ebcdd9fcb55ef22658f62c70913734aa7381d2d
font_02_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 18108 bytes
SHA-256: 9303aaa17a9fee0abf31cb8cb69a3e8d1623c5ffdc0d81c2ab0c7c1b88c0fb94