Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5900c6c7bc92712…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 20:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 119c4dbe1d895aba475fc5cab210efe2 SHA-1: 8f58630e8565d76308ea01f7e05f26ad22199277 SHA-256: b5900c6c7bc927123e2e36e0843c1027caeacc4fc7047e981cec43b31638c91e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by a ML classifier and ClamAV. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or redirection attack. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ptaki.info/imgekoprojekty/files/gefotikifewovuzepuj.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fab3b1b2e---tobigiponegivopelilumupir.pdfIn PDF document text
    • http://ridendo.cz/files/file/wexilop.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/fejesiw.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/xipezefusirinofamapedofuk.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609846c250bd2---zupozubosu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/19588014936.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210530115240724.pdfIn PDF document text
    • https://ptogel2.com/contents//files/lewir.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/22425749140.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f3da73e00c709a07a2fa6fa1013898a5/44154283957.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/84be1946909d0274fe2c392269fbdaa4/3448330202.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/79449301739.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/29809051194.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/28f862a63f97626f27cbfd90a2556e6f/bujovoradupukomivofapev.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f039e6d8c0d1483c54a9e535769bdc38/bokevixiwojepidaj.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c9997a6b---mufakolalazikivekobeji.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sqkraimglnujjhev2t64nh23dn/noliruzifazominarerinew.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c602c9d249b---68524128833.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e8bd3861f60706006b5e7d0e971a3593/xolisarubekoxup.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5kpshbb30lod12ngb8gmmbfq15/6131816121.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/kimedejazavotafatapi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8lvvpmg1ktf382m58fum05ai47/mefigepixopivoziv.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0f13b5e3f---minirugekajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=magic+the+gathering+puzzle+questPDF 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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10198 18520 bytes
SHA-256: 7d33e62d52ae84483f251641062313adf36db5174bea15fde98b562e9d96f89d
font_02_sfnt_off00013266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 10832 bytes
SHA-256: c7bdc3cb22e80fecb9c5c28d164f512435f72b3a0ff77a2a1d8014bcf08a0c2f

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