Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aedabf345a07f75…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 23:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2694f5f68e864992ec1b835660bfbeb5 SHA-1: 4f6bc64ad1760567bf17fc387e6a80085609a008 SHA-256: 9aedabf345a07f752a34ea4c4610cbbe8397769b2b92cd986fafeb5c1accea39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=old+regime+and+the+french+revolution+pdf PDF link annotation
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612199cfa31f9---turegirizixaraboso.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210810_359B31322219C07F.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-12/20210812125448567042.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bb791e3e6ff8b609aad8414a471fa880/wefililad.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2895e5235e---baduvubijo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/ravakuzanateriravojimaje.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0bc6d621d4ce89ee4d8f51c786dd8f1b/16122970930.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/24307917815.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/rukidibejaweporumod.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5ff64f65---noxurokuxir.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/22557508952.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/9637641968.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zimax.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/14428302547.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c758eb2e---fesiduzobijabezopodu.pdfIn PDF document text
    • http://iwort.de/userfiles/file/vesanovimo.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/remibomezanaxaxut.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gabutefepavowadika.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/ravuninuxuwufidose.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/97285344415.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dda707030---27116642484.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_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23F 17328 bytes
SHA-256: dd55ea624dd04f5f153d6b35ed7e5f43dcb2230fc241210bee83565643733c50
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 11092 bytes
SHA-256: 0294788ef42fb78d7c5a93040dc30a812d5c25c09de4b0bdf6d1fda553b7d45c

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