Malicious PDF — malware analysis report

Static analysis result for SHA-256 7574faf6e5944aab…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 22:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e97174b3ac40d1e56ae39238cf78cc6 SHA-1: 45f050e64dc792ca5d1104ab31f09dc05adf4f07 SHA-256: 7574faf6e5944aab1a9be3273d37e3675e0b50df224e84d34fea95eb73048bbf
164 Risk Score

Malware Insights

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

The file is identified as malicious by a ClamAV detection and an ML classifier. It contains a link farm hosted on multiple websites, some of which appear to be compromised CMS uploads, directing users to download PDF files. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ryokanclub.com/FileData/ckfinder/files/20210901_B2FB0984FD99FB63.pdf In PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/74336081361.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/vupowuteborarevuxisedotox.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/roxizezemubudune.pdfIn PDF document text
    • http://yongqingtech.com/d/files/tajipoketodirererajibeni.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/57483596161.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c86a2f5cda843c4f3bbfdbd523ea314/77810198103.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/23015821097.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/tebopudeno.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/gevuviropazolusez.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/bevotunizozufajufevopuf.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/18865296667.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/35533783565.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/kebewume.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eec6316256---31458220471.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/61aca686f4f6dfa99652e61e07a32b56/nifivoserer.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139dba733022---zakamoxipatapo.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdfIn PDF document text
    • https://superpart.com/files/kogakuzibopabimijimu.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/23753688026.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/nugasezuzizekupajujaluger.pdfIn PDF document text
    • http://mlead.net/images/e/file/3142314744.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/79722167252.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/92803495738.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/winilusasisitameromotes.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69403588232.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/12418218909.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=garry%27s+mod+mac+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 18692 bytes
SHA-256: 5d50855cdf5a8f2d1d1c732585cf396a932c293a750f4c1d71b7edf44d5f915f
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 10484 bytes
SHA-256: 7270f4c7a8b9f23eb83ac0ed6d114a8d8ee29f5e7c6fbc99a42a06aea2a2e8de

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