Malicious PDF — malware analysis report

Static analysis result for SHA-256 8747e02ea555dbdd…

MALICIOUS

PDF

134.9 KB Created: 2021-09-04 07:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 209216fe4a45016a334d006e98ea9f2d SHA-1: fbe8284f5bdb4fdb99bc7ae42cedbe56d198f295 SHA-256: 8747e02ea555dbddd6a56a4da98b945059b7e2f5841fa14e2b9938dd91c6eaec
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The PDF document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user reading but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://ksdc.in/userfiles/file/betutep.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/945t8a2or9027278v2u4c85iod/66614166456.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e18637a4---50976024002.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/8ier55jfn35a293o3inunbo8g3/40881379029.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160809f1a05b66---limolejulusalixoduvos.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/xepejafuritewagirelagu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab191ee078---pitutigovika.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/75173330523.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021812134339998.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/927155928.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/beguxonik.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/pozijiwovitiket.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7ada9aed3293617f407b816306ce65e1/gaduzidasinu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31976011584.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/fiwuvunujinis.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071bda4097aa---xukofubo.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tnh63hpkt4kuhrntehcs70723k/fuzodavovam.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/58361507709.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/af907e6aa02cc21f2b57104972d3d0ee/77713319468.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/c28e1b9d0e058ed93910f4e0356b186a/8164580708.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/zexipuruwixenojegotosa.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/32106061188.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/safoxuzowa.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/josuwubusekosazokora.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/tasisatemomofimav.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/norawepenubapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=salivahanan+lic+pdfPDF 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_off00019aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AA0 10240 bytes
SHA-256: 8dc444c84ae117751a47d9f1580f66ef8c257dd29b7e44ed5f3c812e63f11bca
font_01_sfnt_off0001b184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C996 26516 bytes
SHA-256: add8fad89ac1317f9f4e7ca019640709ed60bfb3b55a58b5c01eb0f84a43441f

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