Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccd1390689d5ef8…

MALICIOUS

PDF

82.9 KB Created: 2021-06-18 21:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: cc0f10d08a69af45287b3eda637d0117 SHA-1: da546675bc2db51436e981f8f84c9bf58c211625 SHA-256: 9ccd1390689d5ef8694d0c63156610b4334a9e0729f31030877881845e028023
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious files. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and heuristics point towards a phishing or malware distribution scheme.

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.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7595d4b437---satifiravenukun.pdf In PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9d40af3aa58159e667257a350fc750eb/58085780707.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/30bqpkujfsaaiea8sq5qhqfv4t/pajuv.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/zoxas.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/9cfd06fc4a39cec124bc3538364768c4/zigawapepejox.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/pibujudaxaxi.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/96000729530.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c34e866def4---jewesawudofonu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ea4ac241f.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086b8aea425b---26556439941.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34c9bd99a---68626212746.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/87751358924.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h6hjatect813olh2tl1jj2tfr2/lugirejunetavitubutugim.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/fopaj.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/sofojufim.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3c00baf0455d6ce8132f01096e8ffea/panupisezi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/13181162891.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/50845638034.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/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=narasimha+kavacham+lyrics+in+tamil+pdfPDF 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
    • 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_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 5588 bytes
SHA-256: 32ca0c8a8fbbd14fb6de39646406617daa35f10a4ad382a819234de4955a562f
font_01_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 10996 bytes
SHA-256: a4eb73524a41a842d5886302e61955497d4c05797570ad895655db5f2618646c
font_02_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca