Malicious PDF — malware analysis report

Static analysis result for SHA-256 630c44647e5faf4a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 23:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf3d044483f53c210d4edc25c0edba7a SHA-1: feb1ee6783cd2270865406f32ffd7ad614e672a6 SHA-256: 630c44647e5faf4a2f208e7f5e75d059b5a82452aa6775c6a78b609554ae5df0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613580f276be8---fomawi.pdf In PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/bojopuwup.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/41ff0313be01d78035c30cb04c87cb6f/moselufaduwig.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/080223063131.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41012570973.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/88600785700.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd8eb9750---vutigoku.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/fidinewufov.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/goxalutez.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/dobojomufev.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/zurovividexatu.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613648d1680d4---73627786395.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/26605812869.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/10951851770.pdfIn PDF document text
    • https://ever-progress.com/upload/files/melemujika.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/pofefulupoduzobogaxas.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/6221277075.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7a5817649---12802128595.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/15098498761.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/zexerusapudewafunojujev.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/nereduvixete.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/27699110681.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/47011885079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=novel+the+hurting+wife+pdfPDF 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_off0000dcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 18036 bytes
SHA-256: 6ee2557a2504415c0a1cb65771acc413097f9aa74fea97e51f51892c046d1d22
font_02_sfnt_off000123a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A3 10676 bytes
SHA-256: 976077cc237d8f1dd7179785797a9a1954c3723dd99643e6e2f6aa2792dbc52e

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