Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7cfcbcfd247064…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 22:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 024efb4cf38e38621cbdabd394239183 SHA-1: 57b179046e1ac80f3d76223608de9bb8a12a3ffa SHA-256: 9c7cfcbcfd247064e6ddbc7163cd0f903a6f76f940a2a3c11d220292bbe5209c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The presence of multiple URLs on potentially compromised sites indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a76492cf7---josuvig.pdf In PDF document text
    • http://zit-tech.com/userfiles/files/ninitize.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/97204861448.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/61562170873.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/rakezujemiwi.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/mulemaloku.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/85280073917.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/7055179546.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a872929c61---zaxawozegibolesebobono.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bigizibobipobeloxiwadoru.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/43054331779.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/jexopiranaw.pdfIn PDF document text
    • http://houselandia.ru/files/tubosurove.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5264bb4b---28627824921.pdfIn PDF document text
    • http://benetalent.com/upload/files/mofoturemolomotogosuxupi.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/206215647.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b388a6c2a7---moxuzezewa.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/13448624941.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/pedonuwuzevabopafexilevip.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/82382463482.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/66979464865.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/95042455585.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/gufuzesobewosirobo.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/41855111982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=redmi+5a+osPDF 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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 10240 bytes
SHA-256: 1e0d5ec38e6d453a21227e2f2d18fda3a42fda908e93acff10677ebd55aaedc5
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 17904 bytes
SHA-256: 12476f4c16d0f9c418ee88c565f0e2ab634044a18488177923bef51fef5e3242
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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