Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f5f22cfe20225c…

MALICIOUS

PDF

78.9 KB Created: 2021-06-30 14:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a98b771f03bb58e55a4ba105aa361224 SHA-1: 30bab3d6c7d8bd588a53322b7fc0c2623883637f SHA-256: b1f5f22cfe20225cef7aa47dff6acb27d0f1b9ed8c2ef20ab529e6799a029b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are commonly associated with phishing lures and malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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/160ac08dc18caf---89261044123.pdf In PDF document text
    • https://room12shio4.com/contents//files/lufidexa.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210607073716.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079c39a30174---34301145706.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd7dc73bd---nafelujuvibure.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/6a1ed9d666233cabed1578a9ee9f8f16/23501921008.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608392b7f1774---76771814552.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/jumitokorepinanowem.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pimewinivurabesuwive.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/22217234946.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ca15495d3cf45128234d453d668620f5/8131598944.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/tibakovetuki.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/foxunuregunizevuvijijija.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0a4d2d95---61118952170.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kivit.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f07ebd54---pesidinomikefadizipawinaw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fitowekamukepusimumuv.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/tugisi.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/56299381305.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/dc3c6acfccfe04f3890cca5ee6778467/22183325312.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/zofesikopukogar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+change+a+quadratic+function+to+standard+formPDF 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_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 11200 bytes
SHA-256: 987cce916ed4dd84a8654b17ff8d878a1076645fcc8dea23387cb0f8c3d56a9e
font_01_sfnt_off0000e74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 17056 bytes
SHA-256: b7156bbb63fdaa163995d58a6d3a4a0cf919b6be80338c8604168586e8ed5083
font_02_sfnt_off00011464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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