Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4b2ce1c9dd22bd…

MALICIOUS

PDF

86.0 KB Created: 2021-09-02 20:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 862bac8611ac2f1620cbfd515364dd34 SHA-1: 08b4182598d5d7b87547977337c899fab8fd0de0 SHA-256: 3b4b2ce1c9dd22bd2aa2ab8d2f9f97af987ab6d05aa784ec35c7ab800fcff820
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/ritevoderibajepisisagof.pdf In PDF document text
    • https://drinkpoint.com/uploads/files/rifupal.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43c947b163---gulizoxarufofibomefaluva.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66287a533---sosorapujaxewonap.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/wasubozozaf.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/mosevalu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b82f7857421---52558014461.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/26e25c5036bc05f81e00cdc9e7bbc426/92679191652.pdfIn PDF document text
    • http://nprofit.hk/userfiles/wodunozanateledodazigupur.pdfIn PDF document text
    • http://intersonik.eu/upload/files/darifunatejefokede.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/soraminizimumozimarow.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/xekerefewavevuxobatufit.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62b32fce8---nivuxezuvize.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/saxozezu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/af66455cc25d8f5affa94813be4b4b9b/noxemiwabodif.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/45769370464.pdfIn PDF document text
    • http://change4best.ru/upload/file/pamexenaribopev.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608680acb0d9f---jirivoxasowuwisaga.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///lokizawojalilofi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/lokovujubanube.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c4db2eace---negimunix.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/hgb88kqletb12m157tgkfo8pt7/48263073448.pdfIn PDF document text
    • https://aokman-drive.com/d/files/29273319031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=heart+rate+training+program+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_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 10616 bytes
SHA-256: 536a1a63d831adeadeaf4e08306aa7b55b441785a9e859e1869b4c9bea034bca
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 19048 bytes
SHA-256: 655fc35b115772ffc6cd28ac26e7da01a8cab5febf7a49b3f8769a757fca6dbe
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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