Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5a2b2e7134a5a5…

MALICIOUS

PDF

87.7 KB Created: 2021-09-15 03:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34925488c1800afefa22401b9101cb99 SHA-1: dffb9bd85f5b5e0f128d7eb7bb8934f2c9e0e012 SHA-256: 9e5a2b2e7134a5a5e46a1a932288f4dfde6106ba3e9f42829e8371a73c3b9a6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically related to phishing. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://webmenuplus.com/images/file/5155447391.pdf In PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xutepofugugitenigedesoba.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/semeji.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/23903955306.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/64698100340.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/gasotamatuwipasivulaxepo.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/57213846824.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/99663371985.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/56641102455.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411344bedf1---30613402176.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/tixupuwafikepixabipomit.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/87602253247.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/rewasiloxibubobelibebud.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/44123373978.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/36058595940.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/kafumolejoxugesa.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/tetosizeladigedeluxup.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613157778c043---dajuvixazegiv.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131649298405.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613485c688398---78839552962.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/16576187691.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/29528383236.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/27272873816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=value+stream+mapping+for+services+pdfPDF 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_off0000f086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF086 18164 bytes
SHA-256: f7f5ad5f04f0af9e911bc47db9321465ed093d73c9545fd006dfbc9e92d6355e
font_01_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 11100 bytes
SHA-256: 5d2320891bfd7c184e2e83613f37ad5c318dd0fe2e21cb162cd0367e90b2b8c1
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1