Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b01836eb2c4ebe…

MALICIOUS

PDF

77.5 KB Created: 2021-09-22 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 87cdfc3d43b7aa49bd90ba5098fcfbd1 SHA-1: 88b3013045b2f039d17e961d3b677bc9a0f4fe4e SHA-256: 20b01836eb2c4ebe63fb5e952b530b0768ea3090338a24168e0e178d7ce318db
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics related to compromised uploads and link farms further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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://fxmeat.com/upload/file/ac3b8e60d7018a60a2ce383b865de31d.pdf In PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9273ffe31eeec156354371a18cc1eb45/5507747817.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/91178265852.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87455388094.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/9962901616.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/lodaranenesanowi.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4be165d9---29982255416.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/lobosojaza.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/40011402486.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/36280589987.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/26362300290.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/kigomunerakem.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/88078555418.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/cb6534580f25995bcbb183ddcfb0e137/1186642690.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/nekarokod.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/82452353696.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/52864098742.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7311e2d---6856141863.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/nugexadujag.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/rekagomemixuwakosamedo.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/toliketekojag.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/gupabixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=watch+suicide+squad+full+movie+onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 18440 bytes
SHA-256: 5f446ac796d79d7080ffe8cf88ec3c290cf1172c6d041d140f49b155bf49f0c9
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10944 bytes
SHA-256: f7c247f0a5f435f537a6321ef96e019fa7e88c0661a0ecb375869f6570259eaf