Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e75b3256c5e91f8…

MALICIOUS

PDF

95.0 KB Created: 2021-07-28 01:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 470dbe48acdabc51f435f982b62ed040 SHA-1: e3af48e87b7de753dfeaa585b31adcf2b18028c4 SHA-256: 5e75b3256c5e91f830597130dc224b2bdce790cfcd57d479fe0453892157b328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://status.cz/UserFiles/File/baliwerixewokawama.pdf In PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/54fdi4kl8uddmnf9rfkfv0lfef/kesosolo.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/96163617473.pdfIn PDF document text
    • http://bomtvcloud.com/data/board/file/20210512172530.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/43203933705.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/vepelepitesiga.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/160447a3b3fc7e36adf2b3c3da5421cd/kopupoxadototelevuf.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nevupavegobemadef.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/99238d5efb654ec5fe341df46e63ae5f/74873539296.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/d0861633d45215d04bf93a356d5a2200/wasijabalevafaxapalinunun.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/11515945587.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9a77714b---vomem.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b03dde0da57---91802547902.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/tigubabigovuxasumotu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/17d0d4545b786205a94aef52a7695956/67549633692.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/86525052985.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cc5e7884140edd98ad0c09dedec1003e/84809040607.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/sefutavowusesab.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/fanamusirop.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d933d18ebb6ac44803a1d20708ed9977/83181852224.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c59c05135---48616975450.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/69365514103.pdfIn PDF document text
    • http://polletnv.be/uploads/files/7411795540.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/664ee170fe1310c0d4e49ca4d87f3e43/nekub.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/89435946065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=free+bingo+win+real+money+no+depositPDF 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_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 11052 bytes
SHA-256: 0df310631366e5aaf0a4acabd75195e38f5d21806738a344aff7c4582e1993a9
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 17236 bytes
SHA-256: a376b82c5276f674c339a3fd2be3d5ebed4fb02a2630df9ec830d53e662802eb
font_02_sfnt_off00015628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1