Malicious PDF — malware analysis report

Static analysis result for SHA-256 2299ccf1eb59d414…

MALICIOUS

PDF

72.7 KB Created: 2021-09-29 14:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c9fc12dd22bdad4ce042b1cc09880ba SHA-1: 673c271c7cf7388213358205531b5f19baff32ee SHA-256: 2299ccf1eb59d4145032850fc3dcf2a9461f4573076af7786e6f5a536b9b1a92
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm indicates an attempt to direct users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://thaoduocvn.com/userfiles/image/file/29589273566.pdf In PDF document text
    • http://malir-naterac.info/UserFiles/File/nolesugizirili.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/35956609185.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/91153981971.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/vogozapowe.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/61264852037.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021928447443441.pdfIn PDF document text
    • http://93564497.com/userfiles/rorejopeguwadaluzikisizax.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/solelixetekexop.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/76174766695.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/loridenujowajuwazonilifa.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/rarejudivesev.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/ziwebigar.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/vukememogi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b7c5bb71---palulutaruxugiv.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/91576433986.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6ebcb256258656742084ed1f051eb86c/68324533993.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/708479361.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210903081224529.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/xijum.pdfIn PDF document text
    • https://mkontroll.hu/File/87799599272.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161393f7574058---wijakiregawox.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210917_171131.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=invisible+font+generatorPDF 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_off0000b6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AB 17480 bytes
SHA-256: f581b02130290c513c7427665ca656b735d78f39dea6233685ec7ad4f2f790b0
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10548 bytes
SHA-256: 92d65be47569097e36a32be889b238b4c998c8247a443cb1b954b452db1797ba

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