Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9997ad5afbb8f1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 00:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57982743efd64fe512fa6e8cb7413a99 SHA-1: 509453bb3b8e09a08ec69fccd529c7df38df883b SHA-256: 9d9997ad5afbb8f1bad05299a8cb19a30c490aacb0664a7733bcdeb4d6309088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via compromised WordPress uploads. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://al-farh-iq.com/upload/userfiles/file/42518458337.pdf In PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/mobabimugaxatidojefilu.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gelakunapefasalatijilulig.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b9ce9a44---purevonuvomodap.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/fasuvafapoziwabufim.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/37453930567.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0464ee5129---romarixakevikorumamaz.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/lqftvg6djram1435hdmpf11fuo/42960953022.pdfIn PDF document text
    • http://zhbiotech.com/CKEdit/upload/files/kujifopezufanofafape.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/loduvubosafumow.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/rasepesoberaxolulujale.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/bf61f9b103942b0293f4c33e05694b21/76012405002.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/23911271781.pdfIn PDF document text
    • http://oceanstatevolleyball.org/clients/879495/File/94964858358.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mdqe7v1jajgfd59lr3qhfdtc67/12565223181.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/tufurekalaganufikefozelor.pdfIn PDF document text
    • https://susta.vn/userfiles/file/lejosajafejeluletesepomew.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16118c2fae0f94---74390081887.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/788b1bf70a24c0ef2eb3c5f2b1dd7691/pefidonem.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/xulujukugaxilarujelamo.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/61829053370.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/vuroserediwemiribawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bs+commerce+subjectsPDF 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_off0000d73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73B 18364 bytes
SHA-256: 961b441a712a2697f118bea496e1b59ee16c1f82ff929b26b5ea0d2533265e28
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 10408 bytes
SHA-256: 7195c93bd9819d826f2f48289318e1c7e10b8f875da3b6663343c720f493198a
font_02_sfnt_off00011edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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