Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5510aa32d2d2ff8…

MALICIOUS

PDF

69.5 KB Created: 2021-08-14 18:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0534b4c4ff8fc6d883916c39694e589f SHA-1: 094992f7911b5d00417b749b03e9eb965b74586b SHA-256: f5510aa32d2d2ff83d637c0b7b071198f642dd4d7acee86011a9571da88ecb74
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8384

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.
  • 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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62691982493.pdf In PDF document text
    • https://hometeamcorp.com/images/usr/wuvusi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/442d491491f80e27ff099654afc3f511/95835835008.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/38486850000.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c59885e3---geludupixikexuxirebasola.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/debewale.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/93243322037.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c85262cdbfa9120af96654c8df387f89/7800984060.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f99ab65d91146623c4716073b6ec25d2/jedaripexew.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8e2d468c0---14784017269.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/39802524151.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4747ae4b3a---gozesabesisa.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/59116046939.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/03f093eb33832414497b1358304c95e4/jubiduzes.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/57905117a26890d8e381368e6296e6d8/monipuxur.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/85385d51ecd978fd1efd3560278e72bb/68265984052.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/watonogipuwizagera.pdfIn PDF document text
    • https://tmtteks.com/files/rixew.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/musebimopazuwoniladivu.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/26410106915.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xizuwatibalavagu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/463385cb8acb3d4c01f8d82fd0bc8199/45287242865.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/kuliraliluvavo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9c4mace5qtkb73aknh7lhsq2p4/pigilifopimimosukijokeb.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d98409fac037db15375d234df506121d/fojametafufedube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+resueltos+de+reactivo+limite+y+reactivo+en+excesoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 17824 bytes
SHA-256: a5fe4a0d61079084146c199c5c3d7012a04fba66624545c99fa89f5c8eb283d1
font_01_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1