Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae8d0cf4b15219b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 23:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e42750598f7d7825a4de202b92dc93f SHA-1: d2c51c0476b1b4fe84eb94f7ed007ce123ec031e SHA-256: 4ae8d0cf4b15219b64f95209b20ff482c574c6d2f3fe8bbe02f789791c94906b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://gianenricofabro.com/userfiles/files/73870763859.pdf In PDF document text
    • https://emmaushuis.org/pages/9648627691.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/66499159873.pdfIn PDF document text
    • http://protezas.lt/i/File/61483658163.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/2935403907.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/nanukujifonutadejibi.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/42326655468.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/33666456273.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/87214226052.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/94748209218.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/73677748009.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/97365720977.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/73019295168.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/niwamibevu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/11808996739.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/watorokebetefokunune.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/igbaj99cjnr1cb6tp7fe8df3k5/44944868038.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/lupimogogewokelixebigamo.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/46555635809.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/91230226061.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/29983669025.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613722b2398e0---68041726759.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3748d60cf1daf3f0629f96d51a5caa21/39068208610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jungle+cruise+1PDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 16932 bytes
SHA-256: 2459d2551cea6eef35c6f079e92f88266193c7833895a6f7f5cc49e2d3002210
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10168 bytes
SHA-256: f7a5f18c06801d0087705b418d30a7502f06d06292bd52282f4afa54a2da39c1