Malicious PDF — malware analysis report

Static analysis result for SHA-256 2568b7b6b3715b5b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 00:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 969ab8b1b647b1abf5f0d85bbb273f1c SHA-1: 1b7acc1dd163085ceab7b9127b5af97a5fb38b4f SHA-256: 2568b7b6b3715b5be1a165829247a740d93075728d01df30528e3136b4ce333e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/047923dc2eee8a6ff923b5a23bc28ba9/37042460287.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/wovubomaj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cd63e0c6a---jagoziporugiximi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kefikoxedikor.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/wasuvelefojimotuv.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4aa33ca0a---faropefezosuzi.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/veroluwulamu.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/nefakalaganobisimogex.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/4023553401.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ebcd34e72---ximetezadilizizotazol.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/515cc3e391b2db3591f0e2cb844c2323/sivusafan.pdfIn PDF document text
    • https://jagominum.com/contents/files/56272593013.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609874ef7d7fb---5683391533.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/67742014272.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/32317656436.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/e5f1699a8e78cee078f79b7e476043ee/45033492595.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/25640300129.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/vaxibusirib.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/fbf6bob0n2j01piv1pbsei4p8m/pisexewafemerokege.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/buxumifogorutufiwede.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/57742366974.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/673aa4e922be46466baa1506d43332ab/53141696600.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1b9230f70---seduzamezojemazatodije.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16113f29dc9c9f---90724082900.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/21342388090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=powder+detergent+manufacturing+process+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_off0000bd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0E 11104 bytes
SHA-256: fb5dd449ac88ec32d7668e170fe0a8c9725dd7256b328168e313e045abee6d36
font_01_sfnt_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 15712 bytes
SHA-256: 3420743d7feff1c80de48e10837820df35357d6bfc06bdc0c5b9cbc541c8427b
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1