Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ceee9038611b5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 16:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36a0c00d49dc3c949cd2673336e528d2 SHA-1: 8fb791f3b8470b5d55f612d97a482d65b778882b SHA-256: b83ceee9038611b5a31d093b205ee85d2f05210de63caf52d6d82e214a65eeb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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 http://thankschicken.com/uploads/files/56010908832.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/18132459818.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612d716a8f250---67457966659.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/5420564679.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fatujejuvuporuxusuvanefu.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///21983542896.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/barovemijovetudedar.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/62eaa03db2d55f53cfdd7a4993c5e425/zisapenevupenonep.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jopug6qkbkpks24gl1un1u75ij/muwowir.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duduxevibameguvukejarova.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/gexelopufevemowov.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/171135095072.pdfIn PDF document text
    • http://decorstore.eu/upload/file/43644748153.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/pegekevopezagag.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6309eb68---doparuvugi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/61759259348.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gowulebumupexamefexefod.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210731_CB41B0C2728DC033.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/davodokufuwemuvakon.pdfIn PDF document text
    • http://goldmustang.com/files/files/17312386460.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/52795875267.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd44f979e1---59583579816.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kevugazokovosono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=complete+pet+student%27s+book+pdf+vkPDF 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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10768 bytes
SHA-256: 9474cfc5f471971ea14e8ea898ca9bb334ed50d3786971eee406443db46b47bf
font_01_sfnt_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 18556 bytes
SHA-256: c8be3540a0c975c03908d683cec0317ec6bad16f74ef57910110346afa46bca1
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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