Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d709ba6fa029ed…

MALICIOUS

PDF

142.6 KB Created: 2021-07-19 12:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3a802aafaead4237abb3d6ee0a9d35c4 SHA-1: f0170044b1b3fda7af1955d3e8bffb9b933d4b25 SHA-256: d2d709ba6fa029ed627c045d75a9bdd754bb796aa47af0968baafed5567fab89
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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 http://brcassociati.com/userfiles/files/83234077546.pdf In PDF document text
    • http://safeabortionnepal.com/userfiles/file/51332271977.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b33bf42e7efbc381d06052b32c72339/refozakuketoparefatu.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/48599037882.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d728e235c---tavekeraj.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/pokenivexad.pdfIn PDF document text
    • https://btegypt.comfile/59316784486.pdfIn PDF document text
    • http://calliopegoodrich.com/clients/73417/File/novawutor.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c5f7a130---89752210331.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7b9819af5---magupur.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5990f9553181c540db69004c1638a928/lemimetotavoxijuloseki.pdfIn PDF document text
    • https://htchninc.com/d/files/47469257564.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hmfbeteeqjr11dsmut3ghgh2tn/95392692537.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a160d15a47f4f3c1345fd54d4cbe17f/51995639057.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609717e527058---76977680276.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d9ae9058667881d3dbbbba863c4dc221/zadukefagalapaki.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/592201c0bf3d3a396e69a733da131b16/27715430406.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf026a8bbb---54458021710.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5532ae3f30---xiworebip.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/50655244628.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7f5a88dd---11960652707.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/laxexal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ielts+book+9+test+3+reading+answersPDF 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_off0001c9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C9EC 11032 bytes
SHA-256: 140e9b5358710916cafb5d350d4d8a48bad9e3ec0ca1be7358a394973bf0314c
font_01_sfnt_off0001e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E392 18528 bytes
SHA-256: 558c69093b91f3a7e2c71e322dae7992e7fdf892e39f1cff64b8d562445ab137
font_02_sfnt_off000214b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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