Malicious PDF — malware analysis report

Static analysis result for SHA-256 58523cb3fb0f5bae…

MALICIOUS

PDF

95.2 KB Created: 2021-06-28 03:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2d7d12cd8d7a2a94f7151b4ec700d6d SHA-1: 85485b44a1d481e0065b254496e7d8bfadb23bd7 SHA-256: 58523cb3fb0f5bae64cb121e700c8e367c5f50f8dfa7ec1c1877e0c1ca16b775
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of an advance-fee scam. It contains numerous links to compromised websites, suggesting a link farm designed to host or redirect to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c509d2aa5fb---45208149159.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/662949269.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070aad288fd5---fesawibikapusi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/080376ff51d2d0969ac9a2545517ec8f/44598399569.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2e471c046df2f172d8025db669b9a3fd/nalexowapezadanolonebotog.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7ce50e889049fe63b2fc08af39eb7c7f/94822340789.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f328b88d2e---65196980637.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3130cbdee5983e21bb5bb7215428651a/venemubokaganuwujad.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/xopanamewesojakegakova.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/8bb07fdf0a8bbc49dabfc54427a7db81/95713800964.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607973f391891---25758866591.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///46587895844.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xetenaduviz.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a6c967382---zinojodatanuxuzokote.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/m4hj1b72a1brfep53j0j12i8ml/gujulegapavudumojuxanako.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/91723045329.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vifofutabojuj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85afb4c36c---xotufor.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/719db223192b1f0bf1c0d03769409738/sofajugodimobexanobifod.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b24788ae20f6dd5650342574bf84831e/4311506192.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/453c917907c836aa273df06cc05a56de/jipojovevufopamixe.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/f00b88810b5c88f2dd3db795cfd94e78/48222957196.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8311331e2---18323596896.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082816705b18---zefesox.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e4a5052b---tomobasojifokuj.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/lewiwokuxejotoxibuvufil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=copy+command+in+photoshopPDF 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_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 17456 bytes
SHA-256: 10ce5b87d7c2be58d86b4feddc023a7c40f831c3dab261c1a4950fdc0402b323
font_01_sfnt_off00013f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 10644 bytes
SHA-256: e98ddc9fd7f1d88523a9c1bf7518baaeeacb0681ee8208bf0c9976bd8e80a463

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