Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d108347b8ec6131…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 18:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1e37739bde21f7d98d95246875b0a34b SHA-1: 19f354ffdc602f28e3541beb53eb5bcf14b45d2f SHA-256: 9d108347b8ec6131cc2ebdbee2db5ea522e99265aeab43ab66161cd5922f0a8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and the PDF_RANDOM_URL_LINK heuristic confirm the redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://libertyrealestate.in/ckfinder/userfiles/files/niveripo.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a0a74b8af816e4c68efb3b27723ffa8d/880211584.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/76427785268.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/92245233652.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xerofuxagufe.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/15635357848.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/satamar.pdfIn PDF document text
    • https://psicologopsicoterapeutaemdrtorino.it/uploads/file/23551505205.pdfIn PDF document text
    • http://nineslash.com/user_file/file/tubifikip.pdfIn PDF document text
    • http://naso10.com/userData/board/file/wikesedifupixezo.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/fovapaluniru.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///dubemosigafisetejaz.pdfIn PDF document text
    • https://bor-diing.com/upload/files/66131546508.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/76575216607.pdfIn PDF document text
    • http://husplaza.hu/editor_up/kazifiwof.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161390a4f18626---86072933025.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/53479078771.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/fovofokapojotevepasi.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/veberibunu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/304c9gvvq3uohr1qe737gojjqc/59097865139.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/wijonogukosuvifawijas.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/metovulitigononole.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/95533712897.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0392c9ab4---votezotodakekubik.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144ee0097a38---kupizituxufubobav.pdfIn PDF document text
    • http://rideco.hu/upload/file/sifejajodafuximun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ppv+fight+live+stream+freePDF 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_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 17476 bytes
SHA-256: 57fd9fb9431e8ed93e2c3e38996ebafcba810d2ae961468f8e78d1abdc86de1d
font_01_sfnt_off000110af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AF 10648 bytes
SHA-256: 65751f7f8b1e52476a926d1689ad175707ab808633445f6fb9132f576f4ab1cc
font_02_sfnt_off00012919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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