Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0278be1ddc93e4…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 10:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81987240b14cc29baadb60c95ededa98 SHA-1: 48d05091ecd818f3a1e0bdd2ecbce0ccf6328171 SHA-256: 4e0278be1ddc93e484e4b9d5823d4b97154fe62418013f178a405d56c7c22027
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cructi.ru/uplcv?utm_term=cartea+adulter+pdf PDF link annotation
    • https://glbtrader.com/userfiles/file/xumobekozebatusajojerevas.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/88739696825.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/23414593329.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/zikoje.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/afma5ao17n0tquhnqj1jaa2hk0/tebena.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/senowusaxaxa.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/juwifav.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/91494582741.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/95052259010.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/54980083129.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/kedaxipat.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e05dbb08643156e0627a5b6dbb2b9fc0/jarebesu.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/wemipixobotosegoxir.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/tomira.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/49825538559.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/59084325282.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/17444950129.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/30760763599.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0ffd6b8c---56311490051.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ua8gmnja5j9koijrns07mr44vd/58644007642.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35084035592.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4fc4cb60fa6b30ae1ed28c208a35848f/42625085664.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_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE269 16344 bytes
SHA-256: 5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
font_02_sfnt_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 18720 bytes
SHA-256: 856c8e2fe20a8a92d345fb314decd30d0eb48ff0df159309decfb08c6886baa7
font_03_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 10140 bytes
SHA-256: e1b9d15a1a1610bf601f585ac92cf0d8cb6abdab8b783ef7781a5e41bafe31d6