Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd9840245666d93…

MALICIOUS

PDF

68.6 KB Created: 2021-09-27 21:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fbab893b6b097fbe1a5a01a6783297c8 SHA-1: 26a030b6374d675630ce65b884afc84ef9b31ecc SHA-256: 6dd9840245666d93e63c918a1503a1bf05c82055c87f5c442306570a153cb2bd
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristic firings suggest the PDF is designed to exploit user trust and lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=how+to+draw+a+person PDF link annotation
    • http://cmtoolsrental.com/user_img/files/tivopalametopoj.pdfIn PDF document text
    • https://x-software.cz/data/file/52203186876.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210920_E6484AB4E1D3E42A.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399371eabdc---216686761.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/vubomasikuki.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/61357100341.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210922010846.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/98485054638.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd7eccb9e---45522727483.pdfIn PDF document text
    • http://theponghop.com/upload/files/23155365548.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/salawubetudunejufevoza.pdfIn PDF document text
    • http://artdental.hu/editor_up/90349753905.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/86796013163.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/dovifeseletudotabok.pdfIn PDF document text
    • https://fond.ru/userfiles/file/90678507227.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/defukixunubamawosive.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/41706264520.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/lejeb.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/61810890477.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/5ojf0ovi1d2lj5ma4jb3ke2nr4/pajabisoba.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614002faf2f55---32964851256.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_off0000adce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCE 10324 bytes
SHA-256: e3f77bad105e27af99ff2aab52a28fa35ff6a098e896df7467efd997a42f75bc
font_01_sfnt_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD50 15760 bytes
SHA-256: b73609c46f6072b4dfc291a5f16e8e19a7f32e74a328af35ca726a72a876444b

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