Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290f5a791b29fdb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 01:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59e26874e6122e555415b7056df825bc SHA-1: d6f530c16e0c255e78a108f5da63af04df293fec SHA-256: 8290f5a791b29fdbb0586e8b7735469775174192fc3ae611fbd946aed5718392
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports the attack pattern. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=nova+launcher+fire+tablet PDF link annotation
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/89591197875.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/74073578452.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c96e4b8d7---88912161516.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/bomanabof.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/46738314024.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/gibujixodufafuj.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f91c0538ae---pifibibikexevurotesi.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/gabiwivexut.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/gibagunujabusunedo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/45797068973.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/likeliku.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/rifaxoroguverideli.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/mafoxepuzizijalu.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/sovubuvujes.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/12388443549.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/21824739576.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/zigile.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kavowimimorixabilaposema.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/30077332350.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613073b93bd09---kutine.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/41567589362.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/zodevitadupefiti.pdfIn PDF document text
    • https://sambelteri.com/contents/files/tusenubogelaniwizuf.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462ec370964---tumofedesotipokumokasoge.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_off0000b661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB661 17644 bytes
SHA-256: 36909e4f2f29c4d839595e60384968c06b5a6dbeaab25b2e87c143a5ab10bfab
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 10548 bytes
SHA-256: 829b5e07c4a3fb064016f9ebaff6f5cf682d00567a5b0a67c0aa9ba5880a24c5