Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bc02fb3a103820…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 17:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8aee4543140bcb0831ab216c074a0125 SHA-1: bd6709b7c27246cf2ed84f960723df8418393b5a SHA-256: 89bc02fb3a103820fb2686406c455a59852967f382e4e93fb28e12c461261cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rra37ecfsfaakg6gd174uh9qrf/16712140182.pdf In PDF document text
    • https://ooo-kenk.ru/userfiles/file/miwabifelozanabiva.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/45339385423.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/15101552903.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/48178540133.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/37574566804.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f7cc17653408d7e711d1593b1bd96cc0/14389354210.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/gotodamopeb.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/1180589551.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7d39c2283---lozerewosopinekumos.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa4b3a43a---naretituwizulezus.pdfIn PDF document text
    • https://basisnomor.com/contents/files/467282030.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/24576489265.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/84804552151.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/54213925536.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/89040293941.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/49303956396.pdfIn PDF document text
    • http://live-net.it/file/gajux.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/25399774782.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/nikijebez.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/adca25e664f34c56c93d12dd5af9872f/wededigiribepezokoz.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca3a3eccd---50661729086.pdfIn PDF document text
    • https://stotex.rs/files/67674593277.pdfIn PDF document text
    • http://i-physiology.ru/upload/kuvome.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/35770815808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+create+new+folder+on+androidPDF 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_off0000e662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE74 19136 bytes
SHA-256: 16032e026bb37df78979fe68d1a9dd07302adede455bcf425138399b332e6240
font_02_sfnt_off00012fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBD 10376 bytes
SHA-256: 1504ba0efb7c820faf18e3fcacd110d515bc0064673f5bf5696151657b411a98

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