Malicious PDF — malware analysis report

Static analysis result for SHA-256 8532b0a963dff2f2…

MALICIOUS

PDF

90.6 KB Created: 2021-07-04 17:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b6fc59b8649b1f947362be4fed62bc1 SHA-1: fdc08916542785d6789c25c0b352b03006acb168 SHA-256: 8532b0a963dff2f220f81ea68041d13b5841941ddaf8dae66b5f180a15717141
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content. The file's structure and embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://synerhu.ru/uplcv?utm_term=infra+meaning+in+marathi PDF link annotation
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4b68bcbc6d1e2185f2de828bb32185b9/17466764812.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b40a5106---91677906338.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/kotuxagok.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655637852---vowiwi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/97199388115.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a979884117c---zopovabuleromimunum.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d056d124---sodiseburuliw.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098337c2009f---gipareputanowudogaxe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f428b5e6e8---miwisatabano.pdfIn PDF document text
    • https://diphong.com/uploads/bujiziselaw.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/acd93c56f0e575dff9bee93626fc6abe/9381946042.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/463560ccf3d764f4fe7d71349dc554a4/gulifiv.pdfIn PDF document text
    • https://kopari.hu/files/file/19409594268.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827e072df74---noxaxogimavozoronitinoxur.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cadde45217cf91b0a05c23dc8958d28b/sobil.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a92ab3d66c7026307ec68878331f29f5/zolevurilumelefepilevu.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/tifozatuzago.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3baf9f4e3---jaditematonosigosupomofos.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/vitogofafisun.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/vemijezugebusupofisijapuk.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083656943652---26330872746.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/67361196618.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/3115150447.pdfIn PDF document text
    • 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_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 17880 bytes
SHA-256: b996fa6de9fb2deb2342fcf5b0eca1ddaedacc8fc639d22b0d7e227cc462bd72
font_01_sfnt_off00012e84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001469b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469B 10276 bytes
SHA-256: 047f7b5978d770774eda2e7d31b3d992b4cb13dacd890c885b94f9fe8cc67b35

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