Malicious PDF — malware analysis report

Static analysis result for SHA-256 230895ddca0e41c0…

MALICIOUS

PDF

84.5 KB Created: 2021-08-22 02:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8eae7e969ab7b468b8387bac7487eec2 SHA-1: 8866902073605d240a2270983a43b7ca85bccb4d SHA-256: 230895ddca0e41c0fba0e361268a36a001a111c31d5b909e58dbddfd01451654
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites for phishing or further payload delivery. No scripts were extracted, but the link farm structure and compromised hosting are strong indicators of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=what+is+narnia+the+silver+chair+about PDF link annotation
    • http://luxe-pools.fr/i/File/femixogatodudij.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/zanomujaxedazegiw.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/34819363708.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/ce4b6467eb4f3174b5772dde0cf5aa6d/sirejiganuwefeganijokovi.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/3b29a2214e634795f7d6655e983965ab/48897558295.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/72688106443.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/96224882637.pdfIn PDF document text
    • http://capri.lt/userfiles/files/33842802665.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/76698219c4281bf152bb7ac1861557aa/xozovaxonulerefinig.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/zomaxuru.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/95810542170.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/jeridazotomupatax.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e7ec56607511861602820bcb6c9a65dc/88076339473.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/tugujuwebuvebigir.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb676869345---kolisos.pdfIn PDF document text
    • https://bselink.com/userfiles/file/sazuparokegiju.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46050791614.pdfIn PDF document text
    • http://texmet.pl/userimages/file/87803384932.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b620f05420e---rowezirimi.pdfIn PDF document text
    • http://rcot.by/pics/files/veduwupuzuv.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ejvt6j7rb0nn4i9dmc4u1lu481/14892419667.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/waxirusem.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9648b726e92ecc56d02025c55e07284c/18563849095.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c0f01869ca8b93afb379463ed4616573/8083148999.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/19a27b0ceb67ad99c248c2f769776e30/65571276254.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 17228 bytes
SHA-256: 162b5a5a08af46b4b39e27d4e5fc923ecc37d1a3c9e4da275e300c1e2b28e2fc
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10624 bytes
SHA-256: 966fdd05bec14ca89a8d73d0193cefe9483b31b14e0dbd18bef2ac1d7ad51634
font_02_sfnt_off00012a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1