Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed360db2de76ad0…

MALICIOUS

PDF

88.8 KB Created: 2021-08-13 22:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ced5eb2e7b61acd971f326ea6a85231 SHA-1: 494e56d1bec49f5cdd465f5f7937c87d785c4ae4 SHA-256: fed360db2de76ad00e3d811e2ca91b922d4f8e6e315b9841f095ace1708e70f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8d2764182---431493076.pdf In PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vesikixab.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/os23hvk5it5bnj7t3a0s921jni/4126440772.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/64214b0689109569e9d46735dc078311/26748863483.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889859e86e3---99846446345.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f9a9b12d---42028852635.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/pinevovofexarajuwil.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3719496b4d6c55f09d59f7fe86e638f8/fazikosusijinepizowalixo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f0cad57cff3f19d03e46b2f42c49dc9b/zujujipuxerogimel.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/79697683296.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/54660209065.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ma1ihg5lt8kvsdetrrvfb5fv8h/lebozutemi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/221b2f2ec53abb0c6a508198378f9b00/posototubowoparewifijoj.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/digirapagamufapagij.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a976b27f92f---vanoruvuduvapewatowak.pdfIn PDF document text
    • https://ebooksweb.net/files/file/mamefujupoxi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb1f064618---josuvufapusiranimodesap.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966611b72f9---demegotadakodesibeve.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1ddb6380e4c1d965e4083667fc4f0b5f/nepapizabelaxeziroderasaz.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57134805744.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085677c1c7ba---zizetilujowuzeronuw.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jiluxiteporevapetuxepok.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/88f2ea4ad62f240a0a2835b7c6ff5bae/41083742573.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/93444128749.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/xixeberajefifizoferelutu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b5dcb78bf---gubatufip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=tamil+melody+hits+zip+file+downloadPDF 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_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 17748 bytes
SHA-256: cb77f7069d3ab4ea7bd66faf4a79ec9357a51e12057780c6c84041fbc52d88f6
font_01_sfnt_off00012402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12402 10884 bytes
SHA-256: 5d2c8e45e68e2b3145a8d6b833e5e4dd256866b67bc01aa068fa3de9198478b3
font_02_sfnt_off00013d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1