Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6ea0c3ed25130e…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 09:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0764fc395a119cf6e07e0beea7df5328 SHA-1: bace400aa0f0b7ec4f13250d27aabc22d886f0d2 SHA-256: 5a6ea0c3ed25130e92e4d094aab8d30b314f83da2ad8a3fd7df2d0cb3137db7d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or domains that appear to be used for link farming. The ML classifier strongly indicated maliciousness, and the presence of links on potentially compromised CMS uploads suggests an attempt to distribute or host malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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://ferdavagnar.is/images/fck/file/49580895970.pdf In PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/mamogagogoxasigereporunu.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/rafarokipafiwetunim.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/92001814444.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/46452436848.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/fosaloguf.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2utvl5sdipkfhcojfqhfvqo9gt/dazotokoreke.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff5bc7eb453b277610d7013d8cd31e85/tetiripewu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/vuxurigolewubavoga.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/93745009773.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/21223d755b65ea0e1702e3e4493624d9/salawasuxuwak.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/15301422207.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160924b31e9dcb---67464474639.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/fumageteb.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/zawifupagimiwij.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/q8vu7cvckj9k9hd42ai2uac2sp/85051853204.pdfIn PDF document text
    • http://dsagco.com/Upload/file/70172920976.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/74546561506.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wubari.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/22096476804.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/lagugugiralidapaxokikibe.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/78364995126.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/52261009622.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/nurovetoborarovavojizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dividing+fractions+worksheet+7th+grade+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_off0001032a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032A 16580 bytes
SHA-256: df8888575cd68449400286bde06d6f8d8757fc3a9e561d24e6e4b5ed833c833e
font_01_sfnt_off00012dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC6 11148 bytes
SHA-256: f9d61478bb8f9895059ba48e4e02929c1aaa2e4456699a4cc549224ee4279886
font_02_sfnt_off000147be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1