Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2308d5e83fc76c…

MALICIOUS

PDF

63.8 KB Created: 2021-09-05 11:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae3a5922d7a37f447ab5a0c71bb4becb SHA-1: a9d86c216c13249758db764da4dba438ddab3320 SHA-256: 4c2308d5e83fc76c9006daed94a8f57398b69943eaa30772c518c53e39aa69c7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a link farm directing to numerous URLs, many hosted on compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm structure strongly points to the use of malicious links to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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 https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/sgml10keq3smkc3lvv1brs50fj/93054816768.pdf In PDF document text
    • http://alexhoffordphotography.com/temp/files/file/65826410338.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kikiji.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b87be96294a---tajujiki.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/48322364011.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621829947.pdfIn PDF document text
    • http://belovosushi.ru/files/64063219875.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/54111081624.pdfIn PDF document text
    • https://menu2uplus.com/images/file/salafuxamulelijozizerijos.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/zokori.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/97679042984.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608682ab483bc---valojebuxo.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90849787770.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73ffcc233---35308608208.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/vuwujifezi.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5156887353432db396cd5bd5b4b75eef/75632878369.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/11028772592.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/3416427978.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7d85d289e6453dba9e3ca0971b32f6e5/41755194232.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/77198607336.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/988148e5f6accf35423344498ff30eff/19832354142.pdfIn PDF document text
    • https://actorconseil.com/files/file/16032611580.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/72588905349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=scalanie+plik%C3%B3w+pdf+macPDF 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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.