Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17ae50e2e62d69…

MALICIOUS

PDF

69.1 KB Created: 2021-09-01 02:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5664e035f94affcbff9ee6b643df0783 SHA-1: 17ed54a647ef2bc5f507778a5b0cebf63278f07c SHA-256: cd17ae50e2e62d69870fba4770c76057c3c4a9e6ec77b25ffb8020baced2e787
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t881onbvnaim9sa7lhkqjukd4m/fanibimozoz.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/wozebasu.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/98809773373.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/xavuriwo.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/tobixodabavaraf.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/kopapaxatoludanoluxowob.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/kekitekotagozumiziriparex.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/88704281597.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/t5kc5d3ilf712d1f5ep5gcibi5/tinikixogurobilor.pdfIn PDF document text
    • http://kdekdyjak.cz/data/56987043708.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/pobuzabikev.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/81926284961.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/89788412589.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/kixonotodona.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a719b3b545f---dotipazowizuderabivuva.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6264886ff---wafeso.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/zokafovifiwor.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/75220898530.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92907e1cf2---6618766770.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/xulivonisivedesoju.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/42624036405.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/9285375989.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/gobenagobox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=whilst+meaning+in+bengaliPDF 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_off0000b448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB448 14236 bytes
SHA-256: 5869ff63b322421724b6531ebb8abdfbd6afc60bb04dca8571306c13283a2dad
font_01_sfnt_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 10468 bytes
SHA-256: 25f25e6d7a6ed1250ffe7d89d0cffc6ba1ca586feb89ee540f11c5965c2f99d5
font_02_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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