Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6e42e6dd1c03ef…

MALICIOUS

PDF

87.0 KB Created: 2021-08-24 11:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ea4ca6898d31afc9a6852987990723dd SHA-1: 9dd7af66b8fe457523b0c039ca11cb5894b3869c SHA-256: bb6e42e6dd1c03efd759106958dad6e6a88b099755a72aa2fd765732ca2904a2
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. These links likely serve as lures for phishing attacks or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inverpalmas.site/aym_image/files/63475931495.pdf In PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/c0kkqss9iqehgla2rfb491nhp6/momop.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916ccbc65f0---damawabuwezazo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609463af832d9---27256392916.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wosojesurepofix.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff938641dd---97113713338.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/71631950131.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/judomonupubamavinedige.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/gajazojosop.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///50949742781.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/11086125439.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/98908035208.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/rudemoxija.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/14171034240.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/3cf1dcc87c91b80e730bfa1b4a8efc27/sixovokuxeseneful.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/55326980503.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e297c88bcd2---bibojekerimurelix.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce4388ad6---xutogapipi.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2f4903b5a6dde404d8f2aa08ee51c6f3/pevuxojazirapi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ht7cdvfdur4nu8sgnoinnqrgk1/69805593956.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/fenamubiwukelovir.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ee5db86f7---49972244500.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/gisapugafogavezitaje.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/42849426035.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5560n8uqitqr72jn15lsbed8al/36251613131.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lognormal+confidence+intervalPDF 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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 17628 bytes
SHA-256: c637f396c96bf0e6237c0efe0a19bd018ff4f39025647f257195221ae6dbd890
font_01_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10672 bytes
SHA-256: 6a069300a265954f1ab2becc33af94f006f6977fef9f78e23ffb11ec56586377
font_02_sfnt_off00013642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1