Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8252ccf7ff62cd…

MALICIOUS

PDF

79.3 KB Created: 2021-06-19 14:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: da8af41f12d7b4c244cb287c70908922 SHA-1: 6389c631f624d6dbb5b2542a8f7e973f1d117784 SHA-256: 5c8252ccf7ff62cd89aa12a7e0e59308d612980c1ea34ab6287ad7c6f146e464
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by 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 0.9998

Heuristics 5

  • 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.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee3443608---37130454107.pdf In PDF document text
    • http://qunjl.com/userfiles/files/84556186911.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/81696704223.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/de04b38c7b92d1e95645f6e5e32671ee/diruna.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b53aa76f0e---kifimevunorunexazagulid.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jisasepewuge.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/0pn6gvtj35k71c8728ofmalu30/43025150140.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/7799864913.pdfIn PDF document text
    • http://atek-ent.com/upload/file/25513455213.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/70eff4b3d61ec28b7e8277d473453422/84929539544.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/26n1dcvrh0pn1s1tlnai9453ld/jidimab.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e459b248eb58af5b6fc65a336ab0d40/beramikodip.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431f3508a7---72003419508.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/tokigexajivoxebagijidewi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160767494d4fdc---vepizuwoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pi+no+wireless+interfaces+foundPDF 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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 4988 bytes
SHA-256: e7aeaa084d7bcce43450e04fcc559682489a57f58202d1eeb55f22125a08681d
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 13308 bytes
SHA-256: cca2bbe0a31d8ac9040dc7d1a8f6536bc74e0b6f73ba1afaeec36bb04f761fd1
font_02_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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