Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bb8df17ce1f589…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 253fb44a7127b943d885e34fcfd770bc SHA-1: fc42c96fa06286eff84e81a3cef3573942ac9d43 SHA-256: 95bb8df17ce1f5895c83085e9df90ec7f94a2115e29165ecf9b68df6bbf075c2
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the presence of links to potentially malicious content suggests an attempt to lure users to external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://literie-depot.fr/UserFiles/file/sipibitif.pdf In PDF document text
    • http://carlaschroyen.com/content_docs/80958192560.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/lenimugaxepug.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/rinuso.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/93807875929.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b470979e1f---67309016196.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcb9d7d96---61294441240.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/52356518641.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/xoxowamu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/kixevugu.pdfIn PDF document text
    • http://nensi.si/upload/file/xidirovisoromiwokoban.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/85229016558.pdfIn PDF document text
    • http://synhbio.com/upload/files/79561962742.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/86152040768.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1ut53qm37r9l3t2a3s63mr7og5/xekexemusebelidij.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/vosukavab.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/maxaxemuzipetupuj.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/xetobezuripuf.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/38668561904.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/a2fvgo3n5ioc3pas2qrtaevjs9/60692818866.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/96008553023.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/sopodu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/32790693145.pdfIn PDF document text
    • https://gangnampools.com/contents/files/54879131150.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/49274873686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pixel+gun+3d+mod+apk+unlimited+coins+and+gems+2020PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/53778115628.pdfIn PDF document text
    • 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_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 11468 bytes
SHA-256: 4d92128f6fc438491de4e90be3f2baf3a4398ddb5e0a1070a159eec03d59453c
font_01_sfnt_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 19076 bytes
SHA-256: 9bb18499db37b7d34e01169d7bd3ad6d168a12a95dce0a28f2db1b4b7485aed1
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1