Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad58882aaf429add…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 19:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d12de94f3fbe0917a23ba245c9675115 SHA-1: da4d230257a178aa087234f73fe019b7c08643ff SHA-256: ad58882aaf429add916202a2569bd032ec005ffde8678ef0c9a947bd7d7840a6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the document's structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=2008+subaru+wrx+service+manual PDF link annotation
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703374da0f1---gajatajawe.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/87423718694.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4068c0d61fd1078e226a3048e642eb96/niduroroguwizalop.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/74405036337.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/33436906765.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/kakofexet.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/kawademifagov.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93975c0679---68968017392.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210709_C35B7A9A5DAAA63F.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7c29c0c7---rejumuku.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/frcau8uc8tjb67bnuc0das1sel/jasivubujaguvaxijemej.pdfIn PDF document text
    • http://drhkltd.com/upload/62409821312.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b943e1a941---99838301687.pdfIn PDF document text
    • https://estoniapools.com/contents//files/tugirubujomozowetiwa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4712a3e21---75110077880.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/89fa9b856f21f441133116948d4bf1f0/zusizirugijekonuwiked.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/710783f5ee2fb8932849c6e9fe1b0c75/43851301153.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c72b6065420---55857042826.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eu5pt5s8qgsq9vjsn70pu4b6a5/73199910828.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-07-17/images/files/peditorasusivimili.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/putekowojose.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/98022794945.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/torogozidumaninuzifasot.pdfIn PDF document text
    • http://artediapharma.com/upload/files/xatusixivoran.pdfIn PDF document text
    • 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_off0000d3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D2 11020 bytes
SHA-256: d6eaa911dc893200e5c62f30f162e38b6b1d2b21713c8803d2846080dfd820e5
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16988 bytes
SHA-256: 51475287b962b7772a59f0f613bbfe7929878d5de4a0061efbe3773b0340ef74
font_02_sfnt_off000119a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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