Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bb6b02c65ab97a…

MALICIOUS

PDF

121.3 KB Created: 2021-09-04 16:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a2e23979c16a4a7c62fa4086095bea5 SHA-1: 63b6c04255099a92e3b034b3d528ea5ad4b54792 SHA-256: 68bb6b02c65ab97a2567be71b0c294876fb001ac68b8b6db7cfb211d4054c3b2
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains flagged as potentially compromised or disposable, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alteredcompta.com/buddha/ckfinder/userfiles/files/72508942335.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/65d93992fa1b687a34548cb727d92397/torizipen.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/muxifunazelorewironisik.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/15303176418.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/13968587532.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/55612338695.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/piredux.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rijaxudozigepewafedojujop.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/8333315030.pdfIn PDF document text
    • http://wenxuezj.com/images/File/nuwazi.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160843fdbb1b3b---dewodofamowapexizu.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/mimosavavi.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/dasigifituxejogilasuk.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/3027e8d5b7e0d41bb915b175d165ff0a/kaxutoxakedewanigejidik.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b5b35130ccf0afb2a7e6987753a4bbb2/88665639528.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/lozetenomatumosovif.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b41493df6---70171728689.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/tofukadanipipelut.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c680f3ae79d9c58fd1afe4e348a58671/vudifibamefedagoba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a827f201a---tutufevixivezizabil.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/7be857bf423b5bc6afe5614c156058c2/73427863871.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kutenazopifijaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gatt+1994+pdf+italianoPDF 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_off0001777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F8E 17860 bytes
SHA-256: ca5d03cee0b073679003612f15b0fde5d59e60ee22150eb2eefef60f5b73a45d
font_02_sfnt_off0001bde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDE7 10428 bytes
SHA-256: 64112a4e635fc39db609c608bf616c14ad4d5620d740b16555a81d19593ee7b2