Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b5d1e16c79a6dd…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 01:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6dd792f2975ebf7dadcec11ef5b1fce2 SHA-1: 0093f74c7f2f1eaae784461f99ed805c8e9a0a8b SHA-256: 85b5d1e16c79a6dd69599ad241d43f4027e82e660a84d57b4765898d5c2c326c
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as legitimate documents. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hoaisonland.vn/upload/files/lajiwetu.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fe2a83962---vewalapixatimugovet.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611943f2745d8---11452301095.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/15224558405.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/setudusa.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/82450ebb505db8d245164698db274e8b/183227478.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/25179744704.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8323edaef6c2286cd18dc60760476c36/1621829229.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vejizunakosejalagidovako.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1a0a9325355d2097f5135aef4367f3f5/22218646991.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/392jnbd4i2masrqe8ken7gkpk0/67600747221.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/gizixikopukanomeki.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/36fa0e3d453e90e387c24d21653720bd/xotiravewonomu.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cecea0a9c8---libakufilukalajisizol.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/20514593552.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/82505148067.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d21104196cfc44e5b9b83cd95f1c9735/tovakegizebimimozidego.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/c7ac83e43ce59583f5561ebc7d628aae/36896038285.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70265b98f8---simedulifafol.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b4759f5933181a7ccdfd4bbe0d8a11c0/13222610951.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/doduzozaxiboravufifivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ignited+minds+download+pdfPDF 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_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 10776 bytes
SHA-256: b016fdcf5944a5ca3dfa905bce0969f72cdae43bbf3e26d357bfff365d12068d
font_02_sfnt_off00011d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 19164 bytes
SHA-256: 034e5cb13bad8bd0e8ff08a9b5aa5be0360cf669a8658372721ac4fbb1083838

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