Malicious PDF — malware analysis report

Static analysis result for SHA-256 2000b3da49e5fb9c…

MALICIOUS

PDF

145.3 KB Created: 2021-06-24 06:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: dcd67f55effaf2dea3917860362a254a SHA-1: 7bfbdff1653653a430284fb7f91367b33a2ada9d SHA-256: 2000b3da49e5fb9c290e9cb747b21f0758581b5a9db8b9d16b0c7d88457396e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an invoice-themed lure. 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 0.9992

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvnp8h5llm489s227ao9gso040/889407021.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb0d040c7---47300955961.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f7b58b0666d6166ee9e88093c9c4f9c7/26194544224.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/f7cb7fda293df96c67092cf199f5a453/85542849982.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/84108404965.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/008f0c115f14b8aeb8a305784c3957f9/sapinoxo.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/31bed13bd5b26a887fa8f9a4df85a53c/18932802681.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/tagikoledigureve.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/roxegafolexilan.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940bc7e751f---66604734844.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nb9aja3ld4ff27aj72nbq3rarr/84336289003.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9041808e27d04ee3b156ba175fa245a6/48762473482.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/dda9cdb677291d2fa8803067c5d2b718/sofuxubexidawatizinu.pdfIn PDF document text
    • http://vildmarksjagt.dk/userfiles/file/26671319696.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/zitoxozerevujabemikotires.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/ladejawerefebotazoxi.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=vsat+technical+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_off0001f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F08F 2036 bytes
SHA-256: 1a4ef4d662e30fab08b9767dcacf1baaa0fe85d433254bfaea02fe19ab18fee7
font_01_sfnt_off0001fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA12 4908 bytes
SHA-256: 00bd8383b3708a9f55b736877e587f5cdd97d23569957d0ecb51b8e824f0d357
font_02_sfnt_off00020aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AA3 13232 bytes
SHA-256: cd888983849e09f32821e5866a3d2c47765dcc2feef7c6953470ea5a61976b0d

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