Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17bcaae02e7dd9c…

MALICIOUS

PDF

84.1 KB Created: 2021-08-07 18:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f7d5f759429e4e0a1f0ea6a3521f1fb SHA-1: 1752cf5eb8bdfbfd2d78c95f23df6ea2bb126fe3 SHA-256: d17bcaae02e7dd9c20cbdb0321a0d45f0ccb35ff762937c6f278e45b2e527148
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to WordPress upload directories suggests an attempt to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dichvumayphoto.vn/webroot/img/files/xijomoju.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5d2b1a5ea---78502612244.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/709dd6c90b3936ef9f31aeb84a798b8a/2816300676.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/52511412707.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/55f28f3fcabb8dd903b0d13f6d4b1cb0/kulipapuxafugoza.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/lalasupobibemiwiviga.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1263f23934bb27295b1e66d5806ff95c/lisazu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb9235702---zuzijubaditatekuwutexap.pdfIn PDF document text
    • https://ijpdua.com/contents//files/46437972447.pdfIn PDF document text
    • http://webursitet.org/Files/file/42115985251.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087466ceb7d2---66235417826.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/papalutofedakibigejif.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/sovojelazepa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984b94966c0---lokomakuduwozuxabumo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3bbc40e3f0f544072e8d24080de8df8e/rojizinijopuwudaleli.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d84b1e690---69650039983.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/073a60d85a281be5f322fe26a78aab18/64275781901.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ms41d9ur0h08p88agh83a3v0nu/17701966179.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/kowebonuxowid.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df2a0d8246c---19308897480.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0e4412217ff57b6190c79d40ff68af60/50206343343.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/fanudasupituwizulux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=optics+hecht+5th+edition+solution+manualPDF 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_off0000e2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 10940 bytes
SHA-256: 0c67f5cb77ab75d42c1328e3b066930cbec5b3f05fd89ff6340c7d0c68ed19c7
font_01_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 17560 bytes
SHA-256: dacffc3844049952c443003fcb1fd9700801105c928898d9651f75ba58fd587a
font_02_sfnt_off00012a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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