Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b37ea29368150d…

MALICIOUS

PDF

54.0 KB Created: 2021-09-30 18:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5c03fbad5d1fefce791399707056aaf3 SHA-1: 370dd952e21505429762218d11cc691c0b80d355 SHA-256: 80b37ea29368150dd69c367b7aa4fd24aa641956e58042f167df0bf8940ad664
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised upload directories, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9570

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://serextion2006.com/js/upload/files/xenovipolebijorixunumomi.pdf In PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/supolo.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/xexijubodabugila.pdfIn PDF document text
    • http://skupka23.ru/upload/m/52843330040.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/30755364414.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/77731676973.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/65699092485.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d2f8160175cc600b2686ba2da3652348/36507893989.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/wasoxugusonagebale.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/wanimedenewuzeguxidozoger.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/lifixadakafigarap.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153b13669bbf---55609459205.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/86570203758.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/75568145580.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/kijejepilopunapal.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36183827140.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f2e868f26---wuguf.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153ad58ad23d---8622380417.pdfIn PDF document text
    • http://ping-property.com/user_img/files/21853717538.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/7562114643.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/41611524404.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109280510423583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lego+pirates+of+the+caribbean+ppssppPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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