Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd116209bb88048…

MALICIOUS

PDF

91.8 KB Created: 2021-07-30 20:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3b81da330679c8ba46bc63c98deec54 SHA-1: 7c5222112fb8a88b21197975dec6c0e86799de4a SHA-256: 5dd116209bb88048ba58755621f8772cbe3d7a9dc6fbce746e82cd322a955303
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091ee47ced84---16922483858.pdf In PDF document text
    • http://candientushinko.com/images/file/sovonutidobopupa.pdfIn PDF document text
    • http://chieucoingason.vn/files/duduxegujofup.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/wafotukadukuw.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/2440d6ce660a0267d6be7937fb660846/tewijutitezinimog.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/mefakonaberu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501232618241024105.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/e4jhpqpq0bqct2h1pl3ct786m5/35155310872.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/70e202294dc1a75591b09d18aa87aba3/sorobovegaxiw.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/92557042458.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798d92b4596---69709892381.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22a2030ae---didezetulamomiwum.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c3a501817dade9198e549bbbc4a54440/gesol.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/53862377913.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/mogezo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/eb514d070bf69b17b36e488ec771f511/56291935856.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vilenemisufapetobifovexep.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mojep.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/90361105317.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/17730492419.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc8f90c85c---pewesovi.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/91112656568.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pibasalijilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=2012+hollywood+full+movie+in+hindi+download+mp4moviezPDF 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_off00010045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10045 17740 bytes
SHA-256: 69856c8aac4766a0e4a08ab3aedd879e352f37ad7919dc83932144ad1610d697
font_01_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 11100 bytes
SHA-256: 7d51351d9a0a3f72638d055ad504ab92cce2601c7592fed63c94931a9a7eaa97
font_02_sfnt_off000148b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1