Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129bc3d4501da2c…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 14:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3b82a590fe625c6fba3599a61ceb1d4f SHA-1: 223392fc9154f6ed1d6fbe65b57a1bd0cbf4fc1c SHA-256: 8129bc3d4501da2c2f23b76cedfec520e6560f8e8209fde940b1a24c8ce1ffc0
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=adewale+ayuba+songs+download PDF link annotation
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0554b4f8---selilakijiwoni.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d0b3761fa---vebisuzojidolenulotelibaw.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2c78sqa0c7m9p22rd0hm22hcn3/86518752381.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/29104503401.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/xorakamadivup.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc748c81f9---6940491448.pdfIn PDF document text
    • https://makenie.com/upload/files/85467225190.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c847077c64---jufuvevafumosotujefed.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c7fbfba8---vitelajowidopuxezeramemid.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/34240013367.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090888f9c735---51455903535.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608082efecdcf---jumesubu.pdfIn PDF document text
    • http://shophouse.info/images/files/59329290798.pdfIn PDF document text
    • http://splogservice.ru/content/file/dunefusavonodebevalala.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9b8c9a64ab47a73d765161c8081d50df/74019187157.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/7208e4a847a509053d81172f019b437a/87366718217.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/4990365825.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/62129978100.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/dotumexoda.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9752c38a9---sivolosiperuv.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/55114061140.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n4npl14vip1qmia30ph4vijdhh/18128179540.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/66185186994.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0ce544206---63131619535.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c52b4a0c2---jewuloberefejekukijune.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 2224 bytes
SHA-256: 338b11d291939855dcda84083ac28f2e0bba756a12b47a5d7017b800cdcc0195
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 18140 bytes
SHA-256: 69411efe008fb3e6d5957a76e3c195a1480db11d2b810c9cd4cd47cef5fa695d
font_02_sfnt_off00012b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000143b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B2 10552 bytes
SHA-256: ee626e138dcc51f31941c863a7cd1cf689d993ac71fff77dc11567845be7ce96

Open this report in the interactive analyzer, or submit your own file for analysis.