Malicious PDF — malware analysis report

Static analysis result for SHA-256 298f03efebc69ef9…

MALICIOUS

PDF

100.4 KB Created: 2021-08-17 05:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09f898728b285bfb1da38dc501691529 SHA-1: 794192deafa0d60840c1d3e605b9a3b0ac30bd8e SHA-256: 298f03efebc69ef93ffff6f40bcc8412864f329a17fd4d285a1a54f87fcfaff3
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS upload directories. This suggests a phishing or malware distribution scheme, where users are lured to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dulichtantai.com/files/uploaded/files/32407036092.pdf In PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/41269269336.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/81418101140.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/47351822441.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/181936202460f3fcba00022.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b14775e0fd56228abb040ccbd763a8e2/gegowolasatifopugixopolox.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3a9a9f8eb4a696f4002e5a33dcc51992/keguzamupiwebi.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/boxogomosakipixa.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/fixemibirasapo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/212566733491621936970.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb8ca86087---31143218720.pdfIn PDF document text
    • http://twilaw.com/files/files/zoranukusekobisak.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/fufuxofakubewezijuzamu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3a2cbeb86---95375808321.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716aed406be---latenumi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/80984164638.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2b6cea620f---39688049576.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be26945d055---84255622789.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e36b4b4c---57531878149.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/83565260903.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/nudimodawovisiwevuxinej.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9158ba756---76470992323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=afk+arena+promo+codes+redditPDF 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_off000124bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BD 10808 bytes
SHA-256: 97e4c9d6a496ae3e3ab14aa880f4c07d69431397e93a2d7be7a6331b99c086f3
font_01_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 17512 bytes
SHA-256: c8450750c704b0279906e006b2e48f8b7a599dd0f3b3f770ce132193e9d5e23b
font_02_sfnt_off00016bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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