Malicious PDF — malware analysis report

Static analysis result for SHA-256 3840b09b44ac1dde…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 02:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9827c9af57a859a1508146c31b7e54d9 SHA-1: dff4d41a126536c4d41920123a7d3a407ff67697 SHA-256: 3840b09b44ac1ddeb59215ef6d6a50fe8b8589ae1aba7356596e2e1f43ea0a4c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of numerous links, including those pointing to compromised WordPress uploads, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=arziyaan+female+song+download
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084b343c7ed5---ginakivimapine.pdf
    • http://anvlaw.com/userfiles/file/suzonovij.pdf
    • http://carszana.com/image/upload/File/75576807446.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/6d173557ec8f4ff3a7aaa7455cbd918a/41680509788.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d39df178f3c---duferaz.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d35dfadf599---wopupofunizu.pdf
    • http://pokorny-podlahy.cz/UserFiles/File/patijinuvap.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bb76b22e8af---88062047858.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbffda1dec9---48683726483.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/7bf18cb0340898ca49608ca42d64d2d2/kuzewubusapa.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a6ebfe8e---24681136476.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/480f31404278ea363ae04cb56e0cdf79/jigoroliguxidixire.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2321149c42---39417905212.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38c143f90e0bf6806478efb7b7131d19/sezesuwarepibuzuf.pdf
    • https://autosaloncenter.com/uploads/file/xaxibisoxa.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09b082fa2b---13167724683.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ec451f2387e896974177b0c5ce1eb0d/96370399687.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fooq8n0b271kh964893onu255f/wivemarirofepewe.pdf
    • http://bioterapiazabiegi.pl/obrazy/file/77441322918.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/1e6ae4170b6f6abe82ad88cf3659079d/46615562412.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ff50fc4e76538331dd518df9516ec605/54800827523.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0f59abb8---62110369590.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16078321797841---86041998698.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_off0000ecaa.bin
72836f11f65ea1b3c08ce788e99392e34e8dd31778c1171699be36decaf3146f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 16808 bytes
font_01_sfnt_off000118b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 16792 bytes
font_02_sfnt_off000130cd.bin
2a523fe721acf05ba690d2efbfaecea4ac56fd9300c70aa444a3d09d7f73cae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 10840 bytes

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