Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ed4a9623881a43…

MALICIOUS

PDF

87.9 KB Created: 2021-06-27 14:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 19301274ccd7d7e61b54944985a53a94 SHA-1: 1e6d1d02679d6ccd1c1154adef2f3d25653fc9cb SHA-256: 47ed4a9623881a43ae6bf12e5e90e4021cf65fe6768a1c4f4cef31fb7e49abf0
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain readable content, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c611dc53c7a---wafewaxopepitaziranos.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967bfcefedc---29792885673.pdf
    • https://jamurgoreng.net/contents//files/37594958608.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1984166ebc---pexuwanusuvukuronixalow.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/61933642549.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/cb079ea189160ecfa919060a4ee0886c/legisadudelavenadulabe.pdf
    • http://s2ipower.com/survey/userfiles/files/zitinofejogak.pdf
    • http://bestbelly.org/content/files/files/13342401334.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9fadaaatde8dkb69a3kd5sj4s0/24097455607.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b872e8e5871---lelisizalok.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607567f492b96---16633162327.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/31174946032.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/fefuvepavirumedidawego.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827875b71fe---82242396175.pdf
    • http://animalscipublisher.com/files/upfiles/file/29314637971.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3580d8619---vuvexutiwe.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0bcc38625---32181758505.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/672f1cgc8hoa3kef397mgvlb2c/zuzagosodoxalikonetaw.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/zasugubujafere.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f118cde035---83668345129.pdf
    • http://petra-dario.info/upload/datoteke/59395285182.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076dd7cbb70b---bizozapuzawosuwu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=book+search+engine
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f472.bin
29c821976a7d84f9ce74fbb76756051eae09723a2e30bfb64a165e78846fb699
pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 10512 bytes
font_01_sfnt_off00010c59.bin
750da4974aa5f8585213e7ec9b28acbd8098ba296257122669ab1d7ea023b1d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 17244 bytes
font_02_sfnt_off00013909.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes