Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fbcb8c9e83b1ba…

MALICIOUS

PDF

78.9 KB Created: 2021-09-13 15:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9434935d26d0537073521d6f23c18c3 SHA-1: 1e240243c4d9860898f682f7d7e528edb1b002dc SHA-256: a6fbcb8c9e83b1ba86c05ca9546f619e48695e59ce929dfeecabb802d978169a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS flag indicate a high likelihood of malicious intent. The ClamAV detection further supports this, identifying the file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 http://chiesamadremarsala.eu/userfiles/files/78010700307.pdf In PDF document text
    • http://av-jet.ru/userfiles/file/dojeloloxomapofokik.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/50230300619.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/10576007459.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/zunimobezavefewiriwan.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/2623475263.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/jejosuvaparedifalaribulol.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/mininesipinawajufa.pdfIn PDF document text
    • https://toocapen.com/files/zewasaz.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/puzofanosezapo.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/33100622174.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210910_23D71523DC1B2558.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/kemovudebewata.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7760d7554ef52c0f879eb7ab6efe012c/33273521803.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a5aa30c3---kadogavaf.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/86687070930.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/lowafap.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/12355695713.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/fugogunoselazazulige.pdfIn PDF document text
    • https://music-group-store.com/upload/files/15497208981.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/66147709046.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kojijobemop.pdfIn PDF document text
    • http://climtech.com/files/files/runupiwikatele.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8c6aba38---dijivilobomeses.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vijozananer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=win+10+pro+download+iso+64+bitPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE32 10892 bytes
SHA-256: 17ac2f14f0c4967a128c4054f594d9550427493fd2619bc5dc7829f4ec69b582
font_01_sfnt_off0000d756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD756 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 20852 bytes
SHA-256: 64756140ba3f052d8161371c7ab954ee9fbac34315f0b6b44c81348ad8903d00
font_03_sfnt_off00011550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1