Malicious PDF — malware analysis report

Static analysis result for SHA-256 029c39321fcef1f8…

MALICIOUS

PDF

80.5 KB Created: 2021-08-28 14:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec6142c19a8fdd3a7579bc524126d836 SHA-1: 2ffceadecc8238a47f270ef8678958c2699869d6 SHA-256: 029c39321fcef1f811ed85c9191ad38434f5f24b5b4101976a80d76902914783
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://filtrydokoparek.pl/img/all/tenojexazev.pdf In PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18173126853.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/65430009261.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/getopatome.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xuxep.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40539142360.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160784826e52d5---foxuxaripumugesiso.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a8d2d66f---87224251050.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/dekotedetupuwimakumiwili.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xiwedariliwebupawidobofas.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720d94e70d1---91861853403.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/wawolepobulejepetubumagi.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/61950308793.pdfIn PDF document text
    • https://istanajp2.com/contents/files/50355429638.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/0t96qrqc0qj24qktdoq7h5nk58/lowifozozevikumosefox.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/jefeletewet.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/43903476494.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/94772196235.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a683f6ee706---tiduware.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/bavadetasafet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=100+endgames+you+must+know+pdf+free+downloadPDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16972 bytes
SHA-256: 936dc0b74a8a8b96f141325123d86eed65b6c620cf028402a948006d6a758c76
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 11216 bytes
SHA-256: 5c3280f790b484f105a3ea9fec37bc02af95c822677fd587a4e7810a84adad69