Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f3aa53abb378e6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-16 17:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84e747f9f3dcfaabcb09d2b877ba4a98 SHA-1: eadda987bfa031597f3e6f27b2f795e024b00c0d SHA-256: 56f3aa53abb378e64651e4838a136caf50fd73baffc83436fc595c0b22dcc5fc
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9357

Heuristics 4

  • 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
  • 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://irlanc.ru/uplcv?utm_term=cach+lam+banh+bot+chien PDF link annotation
    • http://ahzgbh.news-read.com/upload/files/93957121738.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/mimigetupazi.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/44061630130.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pirupobef.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/noguzujubamilagafatos.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd82031ce---19082925578.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/nogatefidaxazadu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8f7765cefee1d7b34c70b208ee99ff42/mifosukigojexuzifeg.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143212c70527---zexolufinutiletuxugob.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cba6ba688---zoxafu.pdfIn PDF document text
    • https://redac.ch/upload/67237195624.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/18427491140.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/godudalilirujulafupu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/58sdbar6d1hgcikqc2atealc01/76046136500.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318f47114f2---23261616762.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/favumizizaref.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/77747937025.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/59898583838.pdfIn 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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 10400 bytes
SHA-256: 3360683bfddce5e29cf638606e2e73de081c1ceafd83887218a57f8a597ff87a
font_01_sfnt_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 20676 bytes
SHA-256: 8a55c7bb52f237428cec8d9daa9b53f223a0cf0fc9cd9efa0905e61842ac845f
font_02_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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