Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fb778f390ab0de…

MALICIOUS

PDF

84.6 KB Created: 2021-07-06 04:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7a6d54a05104607fce2ddf6201cbc807 SHA-1: 43a4618d6439af6766f0703aacf8c0ae82a7444b SHA-256: b4fb778f390ab0defb768daf0a919beee996ec31fdfe7d058c56a98cd112b931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a coordinated effort to host malicious content on vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://crysiq.ru/uplcv?utm_term=hand+stitching+for+beginners PDF link annotation
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30b44a435---wukukasazixos.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/b70a53b3c4b7c6cf3842e2358a92fb56/86638509272.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a398695f47b---lulofodus.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/44epd5uctodr3i3l89ruurentq/kubonovapiloxudada.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddeb16128---xodakapukozikuge.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/78190006620.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/07ad7d4626eea4c299e0ca7832dbdc22/ruvewepixipizuganob.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d1a90554---68688207041.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c8975486040aab1ba0aa814ff4276858/garanajitamanijow.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/b3gf9i35jjos3p1sa3r7b5n0ia/nufitidelukip.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607766a2696f1---23203163194.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/xininokepukagalamaz.pdfIn PDF document text
    • http://health-bridge.in/upload/file/10606807298.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c56ae6c0444---45215387938.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/19454834792.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/v8gc1pramnfvf106u5h89vqdcd/40843347451.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9f805a8984793b00de3f4d3be53c54f9/69263788865.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/327a8a71b86615d2c49082e0bc3a5679/26887581253.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24871f611---vusopopabulajegu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/93609107bfebd25df0fc32e9bf868e62/18657241481.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e3e463d52776a1322a90d971bcbc23a1/82271946007.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/10530396086.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/600b9jpmekatd5bi98ftqkctqi/bejafijiguzubekeza.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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 16868 bytes
SHA-256: 2c28a00879a00434c6679a1d926dac2e2d21194861283038c5f7a13c51f9b2e2
font_01_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 10840 bytes
SHA-256: cb1815e73f20e9953a01a5223475c9675a8026a83a6566002ed368a552d29d58

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