Malicious PDF — malware analysis report

Static analysis result for SHA-256 2168484f95cfbdc9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-24 05:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d31db504024097349fab2a3698f694d0 SHA-1: 68366836b325902cfd07ef9126411fb0b3d1a9ae SHA-256: 2168484f95cfbdc947ae2f955a0ed2c44ab2a4b259b8010961a049ed84e65e2b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, identifying the PDF as a phishing or trojan variant. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content or phishing sites. No scripts were extracted from this sample, but the presence of multiple external URIs and the 'link farm' heuristics suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://madhubanindiancuisine.com/nbloom/fckuploads/file/87917418098.pdf In PDF document text
    • https://sabresources.com/FCKuploads/file/jowawedajibap.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/kizobezevomegakozilud.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161335922d0f7a---36706569413.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/25963171861.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/43737880012.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/mizitedowafidu.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/82467641087.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908032959.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/75273235964.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/wudekufuwipesudu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e717617a---tepuxo.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/80684470865.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db39b1eecf---gujuwajolo.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/81886381650.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/paxofojadobatorel.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613219903b9e9---kojoxazezaripuzufodo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614040003129d---57386754662.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/kalegemivoribavin.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16147af21c8abc---46103270003.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/68612503727.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/25828394698.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/13721304959.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/14988966325.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/57384317927.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/32139994448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=world+3+apkPDF 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_off0000ddca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 18244 bytes
SHA-256: b3627c3e45d32ae8342bdd606df2944235920e9a9cd5a1c590e6157a874415e5
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10048 bytes
SHA-256: bf674f79e77ada962245c09d62e4730070a3c2aecce513cc65e1c7bea8f9b3b2

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