Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5bea9fc2196595…

MALICIOUS

PDF

103.9 KB Created: 2021-09-18 11:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 55225bbec4f2bbf29047f46fbc61f4b8 SHA-1: 3d1df89de32cf973c953f5bb630383d1b281fafb SHA-256: be5bea9fc21965958a1dc53883bf5f4a6e8d4b5a876dfabe89e10058ea7b0347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb25ed3139---17804967057.pdf In PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-09/9eaa91925bd81513b963abcc7ead99a1.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/kebanalivofelegavejizogim.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tbipsuhbrajrkp2com9nq0j7uc/97083222007.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/ladosesa.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/18368313999.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/zufutanogadexajuxo.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/19546253113.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/89740729860.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6f41414f---67413558402.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141bcaed8802---30421728156.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/cddba1aa8a5a17272fed5648e0318bdb/71658619494.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4bd5712b---xibinup.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/42794432647.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/nisunibojo.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/zifeku.pdfIn PDF document text
    • http://awards.nl/img/cms/file/jotetodejoposobelara.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210907060359.pdfIn PDF document text
    • https://questyme.com/userfiles/file/wumope.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/75431247654.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/22524480586.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/44260049652.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/tagevupawubadomeniwejirew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=assumptions+of+dependent+t+testPDF 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_off00012c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14437 10432 bytes
SHA-256: 01edbc655b3a68f7281ea86d4fd7fb3f7b5f0c42e8542276c2ddf73edb97ced9
font_02_sfnt_off00015be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE0 20540 bytes
SHA-256: 6c523fcd9d7d172d1b81401022ce6ad9281c15f4ef593f7bfd9215cd7b9b19e3

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