Malicious PDF — malware analysis report

Static analysis result for SHA-256 966c15269f613ab1…

MALICIOUS

PDF

67.9 KB Created: 2021-06-13 22:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 596bd77d9567ed1ba87253826895d46c SHA-1: 9404e40ce119a42d34e3aa810393b1b04d8cf76c SHA-256: 966c15269f613ab1226e1fc361913f918db3526c291538a5e6fe227c9cd3a3ca
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=adventist+study+guide PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/0rhh4ddp9ls5rvms21abj96uca/39087705995.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b8733c14a---zakanigivugojutofi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/vezisovitunowupenukoweb.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/02e687ae6f1b878a70234241dbd7489e/bimobigalegewodufabunas.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fe83bb98b---sipomokajujumibogisozag.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/wawuwirevukuxigatam.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/678ec8b101283dc8cdce091aaa0ae215/mumovas.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/db40ebc9f64d0108d44cd2848c4d42d7/nugenilovuzamidafow.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f91a2e2d14---92200413194.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad91506cf4---gixoburaziximivadenosote.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uv27fc1g7nl46v6iqr953ua4c2/6326592161.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/24729064189.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/sininokosej.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba673bec6f4---46712092124.pdfIn PDF document text
    • https://plasy.com/uploads/file/matufalune.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1670ed930---wozixolanifopugi.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260dc3d7ab---83176775064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 4804 bytes
SHA-256: 4cbbc5c6035baaabc016131239819fb32b1001e54b2644399ae3816fe8a3bc47
font_01_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 10704 bytes
SHA-256: 5a6736548c632a36cfc865c681e9978d186d4df116ed9dec74e25fcbc2e759b3

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