Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b7e1acb0f583ea…

MALICIOUS

PDF

92.0 KB Created: 2021-09-01 09:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a30d9b0c234791c8c49b40152c0602b0 SHA-1: d96da57646242ba7fcad8b583b301d866d1014da SHA-256: a9b7e1acb0f583ea55461b96268e43838d516900dde6ecaaa8d5cec996d672c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://guides2alpes.fr/uploads/file/54240791456.pdf In PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/89fea4310e8eef830c8e340bd4204908/barabemamotux.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb6440e4e1---nefijusopafolelevavaf.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/21639429352.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210720181846.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ed7f8d27ba869b8e63e691c68763eaf2/vujuresakejoxup.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/balozixupuxipovojezuded.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/nasebakitomekukux.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ffd79559dflh1eits31gjkam41/levusiganasigu.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/tikovul.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8878c9cc73---pubese.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2a7b0606579070bda4e8174039fa872f/vafalawemugi.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/26e1a17da4d6613e6d1e6ceae0fcc94a/18360235461.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49d7c8d74273f8415536da72699cf914/befof.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/pewobedifudorimibabasaje.pdfIn PDF document text
    • http://poliinc.com/upload/files/robujetifo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/2d8605552af4c3dceb15a6d0fcaee797/53802739968.pdfIn PDF document text
    • http://christopherdallo.com/file/27051573251.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/91215473987.pdfIn PDF document text
    • https://kermanrooz.com/img/files/nolesupunozagazib.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/popagejajobiforu.pdfIn PDF document text
    • http://rubensova16.cz/files/file/sisojasu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7991e91fd1f551eefac5fe31d04d27e1/64026058100.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zuboterefukegamojila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+long+run+supply+curve+isPDF 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_off0001044c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 17540 bytes
SHA-256: 3afdd04be76c1a9bc026d577c844616d55ecf306a694b5b65f214e84f2594c08
font_02_sfnt_off000149d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D7 10636 bytes
SHA-256: 12ce6d442ff78f9548d39567f70cdf5d8336898d0deb68dfdc7b42da2053038e

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