Malicious PDF — malware analysis report

Static analysis result for SHA-256 66568100ce088c48…

MALICIOUS

PDF

127.2 KB Created: 2021-06-19 19:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d10ee2b06f633e773b08194b69a833d7 SHA-1: ac2b8f54a77527db7c36bc65cfdb6c599ae3f2e1 SHA-256: 66568100ce088c483be50cd9616311007e5451da855c70eb56a2ce6dba96dad2
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF's structure and URL analysis point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/24fc89b2e2f31f3be9bce7c078a5882e/18432293866.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6e40ea5dec5204fe4131e1047a064cd0/sejigugasuzolilarewobatuz.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20a1b16747---tofevema.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8f341861a55473f4d5a884024891db34/xewizitoruruziwuze.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/iogd3hfga14u8ut8697o7fcuac/66401491011.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a279b272b3---23007102736.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fccb13bf---fedawinupabekudune.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/tihrg242jtk5ac014o6jsmq2hi/surajadofalakifezevexu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/22119099556.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/solefilolarurotu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/mazepofusewazeg.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160742a58a58ae---56374649272.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/gebifuj.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081e258a6f1e---wuxolinatidazorinivi.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/74286944259.pdfIn 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/~3/3CAf4wW3hvY/uplcv?utm_term=roman+no+100+to+500PDF 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001692d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1692D 7548 bytes
SHA-256: 3a62eb0ba76996303443367a962e6bc445863bcb45fa75bec3d5b1490b3321e5
font_01_sfnt_off00017c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C76 3072 bytes
SHA-256: 476e0cff09b189781056ac0cb44c86e7d9bd906b7e2dc1c76017e9dc7e8ffd82
font_02_sfnt_off0001876d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1876D 4848 bytes
SHA-256: 0b325a1c4c4d3d2729826a387a473d25de6e5aaf5f9941ec64953d4fb029ee97
font_03_sfnt_off000197dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197DC 2156 bytes
SHA-256: fa0dda360ee2d304e3706aa1523293ad5ecee4d88ea93329e6ec76a0d6958708
font_04_sfnt_off0001a181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A181 15120 bytes
SHA-256: 33549ec0f55b6e62df0e35b54550bfc3b26737325630f0bcbf1e00e2112cc798
font_05_sfnt_off0001d275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D275 18152 bytes
SHA-256: e48d3329a8079fd51f91d5e4b36d0e9a8d9ac66d566cd026f9167cc5a80304f1

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