Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e7af15533d6c00…

MALICIOUS

PDF

73.6 KB Created: 2021-06-20 19:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 860e75a3e8439a7a8ebf2cade42c6f68 SHA-1: 1c39d58a3458303a83410742c24cc4ebca593183 SHA-256: 81e7af15533d6c0051b82f8e3df02f9d60cdf259fe93ca4301fe9cddf3f9c078
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.8175

Heuristics 5

  • 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
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bead60810---47034825008.pdf In PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160827f972d71c---78799955357.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/r2nv960leh1nnnbnbun6bgk830/50671192091.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d213e402d4d70fc615343ac1ad7d8732/25261975646.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/gumekupaj.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hcbl7modrqch30qoolav4r8b65/94352439856.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/m647isafaq62tfujp2ijpt4n82/61095188347.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/78233821259.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/67a5ae1afa8d8b69dd1c189dae58f37b/jogukiperewugenujugu.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ad83cbb14cd0976b9d4cae4ac0ede6df/vizifafuleked.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rlbuksuce9vq76ad2rel27f66c/dixexibusuzuxorixapidaveg.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9bd027aca4d915755fb2609a0daebf33/50905756023.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/275a99c7dc31b9645d132790751cb873/luzasimipe.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/59548221398.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nawifarurusunezadubif.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/DOqCt-cVA4I/uplcv?utm_term=50+shades+of+gray+online+full+moviePDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5456 bytes
SHA-256: 3e4a46324b7e03ba6993bc77d47ccf8e889c2c67cfa421ffb65c6a66a5c1a96e
font_01_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 11180 bytes
SHA-256: 9b7ed709ca286d896fa77a3a0a8f440c454e18fc3bb5c4babcf4eec8652b1628

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