Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ad62d46c2df098…

MALICIOUS

PDF

69.1 KB Created: 2021-06-18 20:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fbfa02d738c160e584c1e1e713e624a4 SHA-1: e753425a264bf8182628137152868f027bd150a1 SHA-256: c5ad62d46c2df0986494cb23ab040d982f4adf169ee3c0873a750b13f676a269
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7772

Heuristics 4

  • 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
  • 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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073312bcc63d---83000515278.pdf In PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2fe2108cb92660bba6987195113683ed/vajekize.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/7noo8dr6qv0irm93qpkgfd8lml/fuzagixaxifobifuvere.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087527d25d7c---2641885761.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/14731227738.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e10be2vvd58sggalj53ba8qu6d/1210103070.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3h62euaqfakers9ls8ji1330q5/pejikemufemumu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f54867d8e---5380464817.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/i5ovgngh6rb8to8l77gathptfb/watutifajubedozuvirago.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/vikelalewo.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/18602204160.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/deminekufipisunopemefet.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xagoxenevumapi.pdfIn PDF document text
    • http://ezibra.pl/upload//file/25365434302.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce10c2dcd---mimesobopavufog.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/lc86apb3ql5cgpchdfe8iff314/63061780056.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7564b5278c---27828473523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=human+fall+flat+character+downloadPDF link annotation
    • 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_off0000e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE369 5136 bytes
SHA-256: 7efa521582117af07fa14274dbffe8ae2ba30fbebeb4ca740a8db5684db35176
font_01_sfnt_off0000f4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B7 4284 bytes
SHA-256: 02497f37ed9f4befa05f86c8645b4ca62e3d724294ebad11b8ef8e8b6ceb5ebe

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