Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e08ed56390bcb11…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 22:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e95bab75c26d9072d89a498f4d38ccb0 SHA-1: a1d82e28fcb2c92254c9d6930cd0ae27c1a22e12 SHA-256: 3e08ed56390bcb11fa07a878bbf982ac7ee25b678b18dda7cdd93881fe6146e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which point to compromised or 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 is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crysiq.ru/uplcv?utm_term=resident+evil+2002+putlocker PDF link annotation
    • http://kiapelhrimov.cz/UserFiles/File/37879529603.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/gewaludenamokewegesaf.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/59018461064.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fakiwixezabedaxebo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141cce632c10---disokuziwubutofato.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca20d026dc---wifobiv.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/70842126121.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/9165121317.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/36037320671.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/pibad.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vavajuvajuwasamutudow.pdfIn PDF document text
    • http://24cvety.ru/upload/files/49723098780.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/d66kspeb3e7b8vgp1em023gr3s/magufubiwekopek.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/komadibodobogo.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/1123352174.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/nafelifudibubaxu.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/nisopixusuw.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/tatoxomozexof.pdfIn PDF document text
    • http://foodchemsino.com/d/files/1311440296.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/40920951059.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///kajujapesajibik.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/13250988142.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77661271122.pdfIn PDF document text
    • https://lapdonline.org/file/babikilubuvifufexinelox.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_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 10888 bytes
SHA-256: b6869d8cd0840452a71bebfde23148bdf1333e605c1b6b4daeea209c37a8be2c
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 17932 bytes
SHA-256: a8bdfd8c36e23631f4d8e8bf59e92a03a63c7dfcf743283cf6a54562e8db63b4
font_02_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1