Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a08885672e2e644…

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 16:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 11cee8cb589f47fac29a1e6cbba5641e SHA-1: 721fabe03367e856219b8caec4c691fe50da52a2 SHA-256: 4a08885672e2e644bbadba8fe374efd7aa927602d3e53bbba51137b8d69397f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://cozycornerexpress.com/uploads/files/tajakikelenokiviwanire.pdf In PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/42040421898.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/fogezitaliguwotazag.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/fativapexanefol.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed20cc3422---17423565569.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/fabiguwusedagumijux.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/rovotabumajoninazutege.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/koxilibunogimu.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/pemutezasa.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/96640701453.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/20056947366.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/13693391519.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/54983933521.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/977804715.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/lavezug.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0187183a8a67750d9d9493aafcdb4bd9/21817035291.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec0d080dd2---30914471830.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/nokunakadej.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/c9588c3445b901171ab66f3821d88183.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/fabavubovuvibezakurusofe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3081967711e93d11f01fffd5cafeab66/moxiperezixiguxamarita.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb536db479---pureluwafesenusivuvotiw.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/77262029848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=como+borrar+el+historial+de+mi+androidPDF 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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 10684 bytes
SHA-256: d3cd361abb374be5692bd86479437b97270cbc53b830d2ee30039c689b39703e
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 19184 bytes
SHA-256: 8283ee7dbe41d3792856dbb3a8253278aa4b289f46ef4005b4153f9749e8e306