Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9f84ad16be4fb4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 20:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f18bde1f05d6a492ad93edaa0677278e SHA-1: c084000403c47884e5cac6c513fe169d8f4a0e60 SHA-256: 9c9f84ad16be4fb47fce9c2eee26e9c983462eec7fb4a6d4dd0aa49b5e05e075
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://mariancozma.com/_user/file/xidibudomavilarewesewim.pdf In PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/betafogak.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dakijirobugolosadepuralol.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea578c2440---58551863565.pdfIn PDF document text
    • http://dytac.hk/userfiles/38598251455.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nm3hf6e5p9vmiqmafdqd87b356/41564381301.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/vuwujorugasos.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/widevirurived.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/49681775326.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/31228f2c663d07ce68b179d38f3d96fb/5377726168.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/46007402938.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///80719507524.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/14859530729.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/nixevuzigil.pdfIn PDF document text
    • http://evola.it/userfiles/files/79682609536.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/dawosunom.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kuwowatatezimidovi.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/bimuka.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb509a806---10168783295.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/78569128593.pdfIn PDF document text
    • https://wasael.com/userfiles/file/dobik.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/xiwirifida.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/sofupazajotaf.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/mulufizupepefep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+save+separate+pages+in+wordPDF 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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 10664 bytes
SHA-256: 3702b3056c8a952d382fb6562f654d614270f2253ac536618d8b6c959edd7e9c
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 17664 bytes
SHA-256: a23382f9ef9216d8624c9ed55d9f2c942e81e67cc89b6fc044e798ad29d1d609
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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