Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc45d98523ed586…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 23:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9da64d8574c14a456aa93f1cb6e04f2f SHA-1: 7df82da14ac30e0fcbeaee53d344ea666379f29b SHA-256: acc45d98523ed58605a06a8dd977eccfd504d17e582b6e0e882e604ac9f56233
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=new+movie+download+in+tamilrockers PDF link annotation
    • http://xpressup.com/userfiles/file/35894326613.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/34207268034.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/53069729397.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1eb3fcf7e95b12a1ba628a9025ca197e/67285077759.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8pvabit6uk053b5cjqv5e7m3u2/39974243686.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d22cf31886dd6a1ca1a0306e829e43a7/72398976180.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/romusefefodi.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/39780169868.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/36548710592.pdfIn PDF document text
    • http://phpirateboosters.com/clients/867602/File/71891866346.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/31538587361.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/gukuze.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7165ec68cd5b970d31d8ace86a3e06e4/98426877608.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/15492348826.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/budisufininivor.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/rabuzud.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783dc55ab4f---34312529056.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607595afd311f---49302700301.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/10484550581.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/pezabojebimuloxikugomaxeg.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/95909889210.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/52707429948.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/15015697342.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/71387166847.pdfIn PDF document text
    • 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_off0000f626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10752 bytes
SHA-256: 923948a5f67abc3165e0055f2dcd2fda4cac50e41a2e5a1d44317ce78164806b
font_02_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 17164 bytes
SHA-256: f59da05db37fce1ed794b9dbdb222894c4f8da71e58dacb8afe7462b5df8be66