Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b52c1023e44c67…

MALICIOUS

PDF

95.4 KB Created: 2021-07-01 10:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2eb08c623a10141fdd0d8146241267dd SHA-1: 0357d24a66aab134534e83a368d3cf73f023b594 SHA-256: b4b52c1023e44c679d92ba56a66109f79016f8a3f09fa268a291af66ccbbd53a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=one+king+west+hotel
    • http://driver-jazda.pl/upload/file/xufojobipuvifajusuxuxe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27dd5422e---37806168240.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a8d64a81c2c---xojogirezolu.pdf
    • http://chretkinia.pl/userfiles/file/wodejitosib.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/32cd4a00e4afea69af490daeffd392f2/suxamuzivanuxorev.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/19473851568.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/biwumapidaxepofide.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/fovixutidalam.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/92419944381.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d018da38e5---52392596619.pdf
    • http://beerskiboot.com/img/upload/file/70295566774.pdf
    • https://socohoteldanang.com/uploads/image/files/sorus.pdf
    • https://moto-trend.cz/public/files/fck/file/94882010198.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf9ba58b05---11084228965.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a02ec837713---kulipewuzogos.pdf
    • https://bio86.net/fichiers/jefojojenalosi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925dad3d49---zoxov.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b14f3edf617---potapukilufuzivepibal.pdf
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/79006340541.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e432854c---62801464206.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jqtt194uu0ihimp6fso4uv7vmf/21824333548.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/1ihhjfl6jjjn80lksh8koamuou/jisilani.pdf
    • http://pro.ovh.net/~tribuene/images/banque/file/3315544355.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001140c.bin
e974bef87f662d4bd165997164b51d0debdee7011876e97e7cbfc6bac2a72e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 10328 bytes
font_01_sfnt_off00012b5d.bin
7143dd96a1c960a1eaac96124f9e53692b3eb9c2e6eb8982df02ead3130acf72
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5D 17348 bytes
font_02_sfnt_off00015867.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15867 16792 bytes