Malicious PDF — malware analysis report

Static analysis result for SHA-256 b409376c4a0a2f44…

MALICIOUS

PDF

108.2 KB Created: 2021-08-01 16:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83f33d9f01e57c3a1ff396fc70e211f6 SHA-1: 11f2834a67f61c544639995489eb6dc12df8e8db SHA-256: b409376c4a0a2f4476de8d544ed2ac23146b590490fb18abb459ad28aa855a37
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link aggregation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://studiovalecchi.it/userfiles/files/47512956633.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3da89c7efb0eef8467930fec251aa287/soradugajamubebone.pdfIn PDF document text
    • http://ridendo.cz/files/file/65570531588.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160996bcd76553---luzikafi.pdfIn PDF document text
    • https://kermanrooz.com/img/files/xijagasogeriwetusemuwanuk.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c43b8dfe---27443697527.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/13743235767.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827be4a4bbc---18726380711.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/liluga.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19024ead2---kezenagufidakujibaf.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6f405a2a---bemut.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/19008641129.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/52710d218c67bf8961e3083ac02b9b96/18434780843.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b6e39ee6e49cffea2e03bd865b09a752/38169208482.pdfIn PDF document text
    • https://dietacud.eu/upload/file/tokozonu.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/78229528332.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/7cde4318f1f9cd8a373b16d38a6ecf7a/4406595559.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e53784a0c81894f1f6295be8fd3acb2d/15321292352.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/8567055582.pdfIn PDF document text
    • http://ta-taiwan.com/app/webroot/userfiles/files/wuwuzasa.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/rubovodiwoz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gaparolorekamelimo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/66786422925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+reprogram+a+clicker+wireless+keypadPDF 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_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 11036 bytes
SHA-256: da096d5ed3f3295b81ef79da91a31ec26e7eb3bae15be9453f3133e6799aa52f
font_01_sfnt_off00015bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB2 17172 bytes
SHA-256: 77724fa01fd4a8d0d46d749bb71ca8dfee4a443ec7683764357f01afb5d60816
font_02_sfnt_off00018868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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