Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ea6ca7facbf3a3…

MALICIOUS

PDF

85.6 KB Created: 2021-09-16 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1ec985e0903762f0378475fa617ea3ce SHA-1: c5a4e5c0fa81bbb4fc5afcbf3beed3bedbd9f471 SHA-256: a4ea6ca7facbf3a36195ab90228edd9ecfae6858e63ea1c49b70fdc78a5287a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple disposable domains, a common tactic for distributing malware or conducting phishing. The ML classifier strongly indicates maliciousness. Although no scripts were directly extracted, the structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely initiated via a spearphishing attachment.

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 http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d5ahm6t1qq6euqelp303aitgvm/59098882693.pdf In PDF document text
    • http://generale-bureautique.fr/gdb/files/file/gapukozuwat.pdfIn PDF document text
    • http://sissonne.hu/editor_up/74183386280.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/tisak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434137a359b---955660688.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210916034246.pdfIn PDF document text
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck/file/vosapurikuk.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/92629662368.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/majofufugomovude.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908030841.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/rolubawiboxufa.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/dojusalomavidugamobeb.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/79611424156.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/491531556d741106e546d802e2c47a8f/56691012527.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/42155339489.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134000a81f3b---zebotinusirukotuvinufam.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fuzozokekanewoduvunuforej.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/91601208146.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/kepemenogibavimosege.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/zemutosasomutemuzaribi.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/81021077458.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/74365003125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=movierulz+jumanji+the+next+levelPDF 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_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 18056 bytes
SHA-256: 03695563ae76edc37bd9544da02924229a311c8be32358c8e872716ef577d572
font_01_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10656 bytes
SHA-256: 8ce34fb521010c025ed1e181fc983f89802018254fcc2b3851d614f2a9c7da30
font_02_sfnt_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1