Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b401bc367431618…

MALICIOUS

PDF

81.1 KB Created: 2021-08-21 19:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e809fb1a07aaa927d3c7324ba5acc49 SHA-1: b1738f2a430c0270b41a19d0c5b568d04101330f SHA-256: 0b401bc3674316189678e88f3e76ef5a65cb0d5331a10cd60bed53a8e91b1395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aplus.to/userfiles/file/kugekoxewesasa.pdf In PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/nidalo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e23667eae---fesuxagonirovuboza.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d84743556429b4d4706816956fbe6d9f/domononakunid.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/59496512024.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/818cp8detg1u1puo0htar6oaj6/12557609429.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/sowerivipivilida.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/97080095724.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797d1a2620---32737867580.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeaf2937ad7---migujomegagafiwoderiwolo.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/79845342103.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086efffae4f7---zazigajajegefusizavi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/suxomigeluwufumaxekirit.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/c8d1e5ecbd41d37c05f4fc26bbdb7917/jijiwene.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucm2dpkj64mum422kjafs47fq6/xepavoki.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7c4fdff6041b8ee85c6add06687c9b28/93188422146.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a08afbe1226---31908998733.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/24571829508.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/81051929452.pdfIn PDF document text
    • https://olterus.org/contents//files/kupasakobajesiteguwapap.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbfd2c488---86367927004.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/varomobuvilekagisibimo.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/jisibikujelavutixuxudik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+tv+box+wireless+remote+controlPDF 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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 10976 bytes
SHA-256: c3d1042d3b8aad43b4e6c4695a6d245be8e17759c2e47e6fa8fe07b84a20efb7
font_01_sfnt_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 16620 bytes
SHA-256: 686d0ce2dc0fa311c1c7ab9863dc1f943290a0f3ebbbbf5358268e1a2f7a2db5
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1