Malicious PDF — malware analysis report

Static analysis result for SHA-256 af16b693663d1f57…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 05:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31a633776616d4c759f1af262ab416f3 SHA-1: d1118955444bec0e954202bdcb898d2369248b15 SHA-256: af16b693663d1f57017c4fd0b591a6d7214bd0449d8344d9c3ea55ebf7011994
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL findings are sufficient to infer malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nextgenship.net/upload/file/20210623162441260674.pdf In PDF document text
    • http://stjconsulting.it/userfiles/files/xojobavijavi.pdfIn PDF document text
    • https://t2sc.me/userfiles/73250380925.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607544936b0b8---71996350483.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/75881629028.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbdc3d9a1b---57115081515.pdfIn PDF document text
    • https://menu2uplus.com/images/file/gefarimakadovagulu.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/b5523ff0925feb8b50a310b3c69b21a3/38596639174.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9042dfb60---64869937140.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/25564a050741eeef506847243aafc3c3/4025343093.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/88651278627.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lnadpbbunhe4jj2n16246qp6t0/41055225428.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/8760818252.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/91859722926.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/dikazobasubujevivixari.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e27d95519f487202e3272dcf5c894aa4/fomivope.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/11723563796.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/gafimufidep.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/mazaxugaripaxejewupewawa.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/mexubufawuvipekupowati.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/mekajaputuzomunuze.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/10990763931.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/gabunude.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae434874c20---5826265691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=towns+in+co+downPDF 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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 9876 bytes
SHA-256: e3904b59979c51df9c16425234e0ca43ac293cb095b3a2e57124eea7efab74b5
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 18156 bytes
SHA-256: 707fc659d7e63a500d9e45511ee43573e67a5157d8c0124e4c8d0e1f3ddb28c9

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