Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc55e6c2e03c6635…

MALICIOUS

PDF

90.7 KB Created: 2021-06-22 18:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 161bad1a6707fd7858a5149486a9c13f SHA-1: 1ebc3ec6bd34e7e82b1c464c437a4f34f5570c43 SHA-256: fc55e6c2e03c66358464626e0d967735638c7f073fae68509ba7e752d26fb9c0
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f807638e7a3c20cb3332f59e3e978f98/44717950823.pdf In PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa206bbd92e---rubedikid.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jabepurevimopikibegora.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5221d300b25a42f59df6b4386b9b89a9/jewumofomu.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/77830695513.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160717b1f9fa39---pojixusadawegulabuganiduk.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4o84lg9t5tnilmbt20gtne60r7/13404158573.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc3678e86---nemurifurolanevitoz.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee637e0f416b93d4098ea537a3246864/6018929687.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700ad2c8ca1---valulixazefazerawemimagam.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/2vdk6rk0iq24r0q273f550hgm6/35608666851.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/legukifabidopurivure.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hcgq46g9pi6ums9ts5ums5u7qk/mivososamumi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f74e071ad---66754673603.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/tilub.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e4b8cb9fc---ravopu.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/dixorufenixi.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/31255179073.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=lexmark+e462dtn+manualPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 4964 bytes
SHA-256: b03b593a6d7ca3d06d27c3a179c53f4e04a0861000d956856a066d56d2a1c542
font_01_sfnt_off00012592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 13640 bytes
SHA-256: 749754d4cf28f3c7bca686ec5ee2007c81d9633ba23a1e2cfc1dd7c6fa25dc75
font_02_sfnt_off00014f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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