Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee5c9e76a482e08…

MALICIOUS

PDF

86.7 KB Created: 2021-08-17 20:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 19cc6d48236c3b275b742a77a6f474b6 SHA-1: 550e76711c230e37cf325419acaf7bf32ee84d6e SHA-256: 3ee5c9e76a482e086ca262d1a2e4ba42bd3bf17bbd90e5368534f975ab831ec5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide clear textual content, but the presence of numerous external links indicates a malicious intent to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1249d1a25---88404128093.pdf In PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107101820538920.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/mipokiwekavazadesu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4476b4f97---76070136273.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/lawezakepesukikim.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/mavixufovafodomiwa.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/10992420730.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/79863373636.pdfIn PDF document text
    • http://furniture83.com/upload/files/49369815439.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/womagarunudefili.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8aedb6ebe---52313677406.pdfIn PDF document text
    • http://inercial.es/uploads/files/12901287902.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9388615962.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/69005594407.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/mumepu.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/3879386550.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/16415737409.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/em2tbttkkfvr70uut44argk3fg/6250170531.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/34412036312.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/52029868973.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/d9vb34a6hokk7mrnv77e99jg4h/fupixupikugajobaziwoj.pdfIn PDF document text
    • http://mopron.ru/upload/files/25437425638.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/6909295161.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e2f695e1cb419f3fafc5e3cdcded7713/5662898447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=journ%C3%A9e+type+ce2PDF 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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 18764 bytes
SHA-256: 86eabeb6a8d93f38ebea480620245c5f7641803f0b7f149035cc7a17edaf48e3
font_01_sfnt_off00011b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B46 10380 bytes
SHA-256: 4ef73e87dbafe3fd607d1623bf834765aebbe064cd3c3deaae93ba64620c3e7b
font_02_sfnt_off000132b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1