Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca9351f6f6daa6b…

MALICIOUS

PDF

67.1 KB Created: 2021-09-07 22:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d46407d1b255f653172149d8e3c4d000 SHA-1: 13586b49505a0100bdee4cbbd08c6d6e47baf698 SHA-256: 7ca9351f6f6daa6b233fd808e03b0aaab2459267f2bae35a1a20989aeec6c408
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code or redirect the user, likely as part of a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6095

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.
  • 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
  • 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 http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/65886658932.pdf In PDF document text
    • https://meganimal.pt/site/upload/file/43759865929.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/44767053451.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46312501385bf29eca3d2bbd11c363cc/sijusisudumuparalupid.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/nijapadasomatusozigaziguf.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ededf80eb1---zotikamafojorovipofis.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/90784767450.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f71811bad85de6a4692ba42592fc0c9/19037852448.pdfIn PDF document text
    • http://llux.vn/uploads/files/72168494429.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/0l3fo4kik5n8djccv7iccj4doi/38491927474.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/50642681184.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/31863639051.pdfIn PDF document text
    • http://fructusartis.com/i/File/77575008910.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/p1lgk1ij7f780cberppkm1g3u1/79932708936.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f377c39cf---jizokukotepofodajoxi.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/81061598831.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/momoposo.pdfIn PDF document text
    • http://deforma.it/userfiles/files/40272475120.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/779465332.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de13e45ede5---76760031358.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/95916682348.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/rufotoripab.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/zugunebuludikezirozala.pdfIn PDF document text
    • http://mgrima.com/files/file/67745113327.pdfIn PDF document text
    • http://samtekelektrik.com/files/26888069529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=vishnu+sahasranamam+in+tamil+pdfPDF link annotation
    • 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_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 16700 bytes
SHA-256: 035c585045e2c4eb1dd5cbe468bcf6077e78bdce2cf358ed0d97e5fe9807ac06
font_01_sfnt_off0000e09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09C 10580 bytes
SHA-256: 0edc336cd329c0e965c874aa23d3b02dc105221a15ff4e5fe8b290431fea3aea
font_02_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1