Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1f6c4ba1b13a25…

MALICIOUS

PDF

80.2 KB Created: 2021-09-08 09:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af7ae6840b8d44cfd78fe83eb9c7c186 SHA-1: b435225464bcfe79974d88956a9f7931d6f0ad2a SHA-256: ad1f6c4ba1b13a254608a0dc8a251c1073f819d8c5838012f540b8c49e79ea72
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs, particularly those hosted on compromised sites, supports a phishing or malware distribution attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87b43d6cc---pepef.pdf In PDF document text
    • https://caffedisanto.it/file/zenivo.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/76094526491.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/dd65ae7f35df8cb2935ffcd25b68d140/14638234815.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18af87583c---vujomexufi.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2210a8a33876a2ad7b7269e4a4e2409a/zenolix.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887087a949b---fivubolorewakije.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/90237081417.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/migugalorifawoxutig.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255d459fb84---12766725134.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dca6840d177---dixufipelegozemo.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/72d28d4e8d7579ce2c6fe1eb3f977236/tijiru.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/97245727619.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b633bd874f6---40219707801.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac227c996f1---kodinivezopojo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/dqaakev2fqc3n9k0cuia0u7765/95076643488.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/saxuri.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fixupuwunujafapujab.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/nevig.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/ratifojalipow.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/45a691629dca93a2265ca08643698448/jibififekel.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/fetemenow.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/3559274247.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/muviza.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///rapes.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a848d090c---32899932713.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/6db0694984ab304a1d5e11147e603a50/28934238546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=eml+to+pdf+free+converterPDF 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_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 10408 bytes
SHA-256: 84b4a7a698f9ad9b01095de0cf33bcb6482bc04f908af8aebb49384b2c442aa1
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16392 bytes
SHA-256: b0cafbe0774372d7daccd4dc6642534b0d37955667b144a0e6a4b5b56184002f

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