Malicious PDF — malware analysis report

Static analysis result for SHA-256 9adafaf462dea8b1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 06:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed8824df56f4c40f233dc297ceea37b0 SHA-1: 654d509ad0d2028e0681918e0ec155b5b0af25d0 SHA-256: 9adafaf462dea8b1d6f99135525f674a7d9f01476872a50ba62cb69313bd614c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate a phishing or malware distribution intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting it's not intended for direct user interaction but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/n6o8mootk5mt5hq3haaj6nq4j2/miwariporulis.pdf In PDF document text
    • http://auapp.ch/userfiles/files/89692547726.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/9308861330.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/89930281119.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e5f4336fec2954b53d6a3c6787f9e322/tuluwumarovegen.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031364308---49357610715.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/nokazefugoba.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/33687363219.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/89285245387.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/67439049618.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/vukiwoxelixujibukeseza.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/22363249096.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/dinulutodusasowidad.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a3c1e20acbff1210d184a8580dd7776b/buribigivisopamenirar.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/62369743487.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/65392888105.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/63072141918.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160832b25d60a8---5113469250.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/bb1c773929ed287e96d0d55b5f3f1457/buladurazisubof.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfba21273---wexebirubo.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/63861919799.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/jumigedewetuwot.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/59107343171.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021062613433445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=california+dmv+written+test+2019+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_off0000c96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96F 18320 bytes
SHA-256: 4ec0dac82bb3e386f67aa0ded98d60ffd89abd8bd526ffa69dcbe1212c7e8107
font_01_sfnt_off0000f87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 11304 bytes
SHA-256: ea86686ec9abf7bbbcba6974221d4d714417adb9175006a355acaa780b7485d9