Malicious PDF — malware analysis report

Static analysis result for SHA-256 6816c180e5c6995e…

MALICIOUS

PDF

101.2 KB Created: 2021-07-17 22:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ec48912eae80df7628be08dcd740d30 SHA-1: a847a3365963313641b5e042b4f518159c3ace51 SHA-256: 6816c180e5c6995e61c3ba155e6f74b3caeec031fefc4590e12ff4a9394f882d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9253

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d89dd3c7de---vajaz.pdf In PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b793bd14d1b---karoxug.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/padikabefotafebo.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/31181127394.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825d39c2273---3491556133.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abfbf287a5---jojebabulaxofijiw.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8ce0a8e78---60486070427.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/wabetuk.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/45687042304.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/fugotazajegexixawi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63e92e4a77---30352939912.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926e52a0636---89191914112.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/86435139187.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/191db1f5bb3ce5847b568fffbbf87976/makalusugivefajorani.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6def1be37fff02d78c79eb931b94b6e2/87706687391.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/93e4e37116406430d9e7276ca9731817/bunivejimejaxozuso.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9dd058d0e---valip.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/dukuzaverepuziw.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/sosaxuvuzitiru.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/50309806845.pdfIn PDF document text
    • https://areicon.com/images/file/84665601738.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/71kq3o6s1lnfapr0868p5iiedd/kotasutezokasaf.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/kakosezupujesosolazitafel.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/84549124449.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084c13179dad---pafimudujew.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/845bbe9e356dce6929215fbf261093f0/kigowudupaxavidotek.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/0d8dd0d9ae4c90097cacec4c0189b0ac/38277895245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=emphasised+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011441.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11441 18528 bytes
SHA-256: 5d538189f5733be59bf86cd959e9fa22638e43c582094423aabf0c6a0c343885
font_00_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 10504 bytes
SHA-256: 0ff0757576f9d2f72a5d7dd41ce5471819acc23a2ae27c8c2cc03b4eca0d32b5
font_01_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00013251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 23160 bytes
SHA-256: 606057bea64601e69a7faa09d6ca3396176d904aef4ebb552ad46292bc58cc96