Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea191bfda7b8bb17…

MALICIOUS

PDF

94.3 KB Created: 2021-07-27 19:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e97d01593d8062e973ac645a342bdce0 SHA-1: 8f9d00e3e8a13228484cfcf4aafe37522a3f244f SHA-256: ea191bfda7b8bb17dd42eff2cdaae987b8aba9f7d5c03f21bd49561d69d4780d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. Although no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.1445

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
  • 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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a091d786---gikaluwaxevuzadoxode.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/hksi3lu7rpr8gs71ta5nmtelug/35638147929.pdfIn PDF document text
    • https://asi-filter.pl/files/file/47643439511.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1112b827a---98123374749.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/60066712650.pdfIn PDF document text
    • http://indel.sk/userfiles/file/27698961613.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/xiwixawutoj.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/21165447208.pdfIn PDF document text
    • http://mega.kz/media/upload/files/mulufimako.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ca8343990a255708a6a59e919bf21b5e/12797328646.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/luzudadagipesi.pdfIn PDF document text
    • http://jar-ted.pl/file/52903695444.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/retutotevisevovemej.pdfIn PDF document text
    • https://cooperspick.com/files/87493372397.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/tuginaresofademakipipagi.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093d53b3b4da---nafipofalo.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/63715780724.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210618192014172.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/sl4tht719hhfbdme7dgnggqjq5/4264956338.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/41822243930.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4986e7fe59e9821c55b359a8ac154a20/golimimenagurugiwufagef.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/30476072810.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/82603648571.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc7727bae---5847052238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=haftal%C4%B1k+ders+program%C4%B1+%C3%A7izelgesi+excel+indirPDF 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_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 11452 bytes
SHA-256: 060a6618e554ab987b19610246af97c12c90c37b4e3aab7c3204923ab0206506
font_01_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 20036 bytes
SHA-256: 83494f8aad59d242db14b955164e5a7ad8cc8a5f7aaec0e42c47de437ae49307
font_02_sfnt_off00015f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1