Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd7937e1416a8bf…

MALICIOUS

PDF

90.5 KB Created: 2021-08-20 15:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61f15369c22234597b6c469869666228 SHA-1: b202f64d663e78f475935d7ee50f06fb3083e770 SHA-256: 4bd7937e1416a8bf742d8bf68af846ac188e3270e257bb4d1dbcbf75080e730a
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external links suggest the primary purpose is to redirect users to potentially harmful or manipulated content on other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://to-tuong.com/media/ckfinder/files/4097821445.pdf In PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/bvieajb3mhcblti7i8jja6ee70/fawefogifa.pdfIn PDF document text
    • https://12tiga.com/contents//files/maxososejeradipenu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3fe72888c8220f19b66b7a96852d6d05/vorixozate.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/rebamit.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/menuridafetoniluvutiba.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/82083848061.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/pusosofusobegonu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3c62a987---bivedosepurotaboxa.pdfIn PDF document text
    • http://st03.it/userfiles/files/28322582185.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3745531fe7---69192585773.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1fd1b78d55---taxiwuzosimib.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/dalufig.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/r7lsb3aloaba4kqo1cu66oiost/27707730057.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/1391353930.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/62fbnfo1uh9j1h50mj5f7gqvg5/42580495614.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/68104177552.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610fa308beed5---68612392818.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/14697856650.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160795d7f6da11---gatitedupufegewepogudo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/82c533901e9c1136e65007db57830f61/lejulubazojanilikewofe.pdfIn PDF document text
    • https://tch.lu/files/files/92182350541.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d2889894f7202ce2f62ac88f9c009869/34698565181.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f68f0daca8---39228830008.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/fojotiwevodujufuxevizuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=black+demon+slayer+guidePDF 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_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 17660 bytes
SHA-256: 8d0ca5a33ade7fa5704fad3fa97b2fd4b9d43c1026f3e7c2f5c6053120fd531b
font_02_sfnt_off0001434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 10976 bytes
SHA-256: fb5e4887ae3f976fe53a2fa4e44194dffc2735b565e8eb9645ad96822920cc91

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