Malicious PDF — malware analysis report

Static analysis result for SHA-256 385f462ee30f0fe8…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 18:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00092a88c1497e3250b5fc8aeaa0a819 SHA-1: 12288586211f3ececf85c6621d44b6fa67a0cff3 SHA-256: 385f462ee30f0fe87e0e15c53bc26a0d88aee4111ce08fc6f3cbcaa6af62a37a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2ce580b3608db851ea5f78955e3aa046/59214265203.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/popudin.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160718f995125a---59051392311.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611020c1c5c3a---vepoz.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/79395245402.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/17610407475.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b706e69c1adfecd1396cc1305b677f5f/37390315653.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae6a5d8e0---pobinofujavavolewi.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/abdb05c4bab48cd78c5a5d08126c1f7f/rubikavagagowuke.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/183a338d01c30859d4021b4f8971d74f/xovopibajanemi.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/linixobujuwi.pdfIn PDF document text
    • http://c-amc.com/upload/files/48536441747.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a74819f2d06---gejufavobiwupud.pdfIn PDF document text
    • http://flirdining.com/uploads/files/27352669531.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/575000885426d5753ee33773df025025/31115457345.pdfIn PDF document text
    • http://hongdacable.com/d/files/jinamurevupo.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bawosona.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607d082f6a621---16094943745.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073d82396a82---xelesimeburatinepo.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/zuzisakaj.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/razezolubokabiserusewob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=human+genome+editing+science+ethics+and+governance+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_off0000bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 17508 bytes
SHA-256: ea439e978d93003ef1143c517d0a186cf9a27dbd1c884f98d98dd32665da6cdb
font_01_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 11180 bytes
SHA-256: 2ab566c775e33ed2282ea43548543b6a7f8bc0df6385b6ceda32401f37846c44
font_02_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1