Malicious PDF — malware analysis report

Static analysis result for SHA-256 520fde35b7527634…

MALICIOUS

PDF

101.8 KB Created: 2021-06-26 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b62e34b16e7540fe78286489784f60 SHA-1: 06b5c4295ddb131902a435d3dbe28bcc3d81f193 SHA-256: 520fde35b75276344dc54ad4451d19f8e5ed32f17c7136e33dbb6d79e96e02b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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 https://nistd.in/userfiles/file/74067255217.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/45ec731085ea22aeea66edbd13f039ef/53439442543.pdf
    • http://dalaichau.com/files/95170524593.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae41349de---54742479389.pdf
    • https://myphi.biz/nbloom/fckuploads/file/57638836957.pdf
    • http://becucci.it/userfiles/files/vukifededi.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802fad3c254---tesakudogi.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a68c26f494---51012858096.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071de52374f5---sapinusujiv.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l20usepugnqsft7mp3bi5fm6uh/veleweterunanupuwunez.pdf
    • https://mvpartners.be/images/uploadedimages/file/15345911362.pdf
    • https://responsible-tourism-alliance.com/content_file/files/25659822792.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/9f6a813d79009ab53d2ba74447745b25/81310167695.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c85445ee3c404148e6fe319a1b5bdf58/24267722838.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/79122599148.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61b251abb6---22431735405.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-4/20210504152136653153.pdf
    • http://byty-pardubice.eu/UserFiles/File/kobamanom.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f3c763f0---41675769902.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuxekuzekuzunax.pdf
    • http://ferramentabelleggia.it/public/file/wavipixisewe.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/kuveleg.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075439445a08---54675940562.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd44855abb---43612379396.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/86672719133.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=7+point+likert+scale+frequency
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1f51416d0c00f7e69c63c3555a88c03d/74346881310.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012881.bin
76a6c350e9e0049edb2879a1b84e05571796a0e85a2d2158e3ce843e6cab4b8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12881 10876 bytes
font_01_sfnt_off000141de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141DE 16792 bytes
font_02_sfnt_off000159f0.bin
75ca612675e4db278d6856ccb5658b2e6eccb090a555d80df511a32a03982c61
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F0 18388 bytes