Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b88232ea15b66c…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 21:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4554bb97e8b22a85f1e498b7d3830e63 SHA-1: 6505ece8de8ebb694a8eb8d840f9e21daada8ffa SHA-256: 09b88232ea15b66c7bfb89258f45ddaeb9dc5075223c6202df809b4f4843b0fb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The ML classifier strongly indicates malicious intent, and the structure points towards a potential spearphishing attachment. No scripts were extracted, but the heuristic firings are sufficient to assess the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nguyenquangcomputer.com/upload/ck/files/serimatomokewodidebofa.pdf In PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/2425884d117c0a28ef2770c71d5423ce/16245172175.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/16483394410.pdfIn PDF document text
    • http://erpos.sk/data/files/71937526321.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/velidupiwonajumudis.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610a24147432e---lakijajivowukalaraje.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/416b33a7821162e61b2b9fc8b2efbdc7/94986161637.pdfIn PDF document text
    • https://marigabung.com/contents//files/899821868.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/sukisarekakazabuza.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/rigigininesa.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/38091229424.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210810024729.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5e5a700e---59592195877.pdfIn PDF document text
    • https://service-panev.com/userfiles/42342192671.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/fibigazijofasezi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078398827ee7---lexalef.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/o23kpghnfuj3kgsvnvksep1jsv/74803681372.pdfIn PDF document text
    • https://mkart.it/uploads/file/42746102182.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///3381822239.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ea2130c5eb7eadcbe5cab41dbb4b7d6c/8276559810.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f551471e6b8---pabivogunivazag.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/giwenevudedoluselo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/fovabe.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/72646579978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=most+important+inventionsPDF 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_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 10428 bytes
SHA-256: 52e64759619075ee024823d43c5f953464f82e18a6a561b7ea3a36223f04bfd0
font_02_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 17072 bytes
SHA-256: 9d18a4e817e4fe5f752acc82d72470b89c8057caf22614091c755edfcdceb216

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