Malicious PDF — malware analysis report

Static analysis result for SHA-256 276a29d7d82e4cff…

MALICIOUS

PDF

91.6 KB Created: 2021-07-15 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 75d4e1ccca69b18947884631a4fa76c3 SHA-1: 2e2b0eb9b7574c978a90078c56dcc558f3129973 SHA-256: 276a29d7d82e4cff0b127f39d644055d0aec98b89401c6876a7a3f1dbb86a342
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or malicious redirection attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. No scripts were extracted, but the structure and URL findings strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://martonaroniskola.net/userfiles/file/muzubopomakakuviwuja.pdf In PDF document text
    • http://nitexprofi.cz/userfiles/file/95518004047.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0kb26kdrq6t7du58jl8kgojrp3/razisej.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/dibelamuwidej.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/sukevitexoluzonumopowi.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/koxikatumabarokowal.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/062310559959.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/tojenep.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/38832246616.pdfIn PDF document text
    • http://waypl.pl/upload/File/rafogotetagakukoxoduge.pdfIn PDF document text
    • https://curvy.tw/upload/files/losixapog.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/matuzu.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/93629305142.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/10881841123.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/ximapuwevamubuloj.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/tokuxiwarupiduvilosizi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d782294669ac04d99cee97c616bea54e/85822296511.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a9717e95f6bf1e3ec4689dd586aedac7/66991424531.pdfIn PDF document text
    • http://tw-go.org/files/zawumotitelu.pdfIn PDF document text
    • http://com123.vn/uploads/file/74858210112.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/59991212233.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/98409980651.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e8a34b17---vapopekejowivorerimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=philips+cdr+200+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD48 10772 bytes
SHA-256: c5a664616f6bc5342a39a3d2ecf66017e0c17c7c87d008e00ecc529cdc5e22ec
font_02_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 19812 bytes
SHA-256: 516886daeef668bc1fcd2aff8841c4b206eb6d9b4c4876703e861a811ab65ede
font_03_sfnt_off000148fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148FE 16428 bytes
SHA-256: b4cc2700392b5b7d0da2635ebe2c10a04988c4068ef7b9dfd8baaaca2edff393

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