Malicious PDF — malware analysis report

Static analysis result for SHA-256 286de10fe4cab34a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 01:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b16257e1d91038983444078f0baa5452 SHA-1: 2052dd27e35f9b3437e8654a4fb760e6381abc07 SHA-256: 286de10fe4cab34accafabaae0379195f6aaff0ef9fbfe400cbc7346c411b9ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript stream is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=fast+and+furious+1+torrent+download PDF link annotation
    • https://liepasmuiza.lv/userfiles/library/15360281121.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/97195450717.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/novipozip.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/kutuvuri.pdfIn PDF document text
    • http://simoncaulkin.com/images/57423226920.pdfIn PDF document text
    • https://matricula.arendic.cl/files/26720820350.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/25278156733.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vokimavuloruzugepe.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/90307983319.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/nilokolafexivadigiwamu.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/sizefamugowubovodi.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/74500688957.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/sv5hco76gahatanmq12i2p5pjc/64043930182.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7bc83694---27071172701.pdfIn PDF document text
    • http://imbirimbir.ru/files/54733707096.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gezuwesejekawoxuzesar.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/43591485562.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/to4l4bqvmud5m44qhjgh341mcp/zoxomovegavalamajixipe.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rizadoxom.pdfIn PDF document text
    • http://erago.cidees.com/uploads/files/nibosaki.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/50697963842.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/doguwapilubajedivasif.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_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 10560 bytes
SHA-256: 9abe21ec86e8021b3c8727cf45318067efdb9a61504afb3b39c6f6b36d841121
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 18252 bytes
SHA-256: f5d5531339c60ee630bb0ffbbb0a4c8c4f2a6ce3d7d3a6f5949daa5878a3ff4f
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1