Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25e4e4b4d431991…

MALICIOUS

PDF

82.7 KB Created: 2021-08-12 05:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: c21955d138ba4478552e04b9bab1b64a SHA-1: 61762f6180e73811101136621859cfcafbdc4d26 SHA-256: d25e4e4b4d431991350598fff70f8b4f5bf02a6f8c1e401e396ed7d8728c0e72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://inwebjor.ru/uplcv?utm_term=market+leader+intermediate+3rd+edition+workbook+answer+key PDF link annotation
    • http://beepost.vn/upload/userfiles/files/memuzobunik.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/boxipipibigelewokuzusuriv.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/59b32a8eeb416df8f4258510d66206d4/88948083605.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/40748566919.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/75178077117.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pbrd8669ofjeoqpom37a2bkv49/memegodu.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/vawenenefopof.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/92680521031.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/zafad.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076ddece25c8---xemitujeboxofolonemusi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f277d75635---fidemejerokenelina.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d956ef9265d---49050137377.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf64c4688d---mexonogigojujanixekotel.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3hojv9251qdnn9ldcf9qqh3mcm/wugibigupiberusagum.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/72819780216.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/48d3f9b205a7155897773e5847fec291/69716378794.pdfIn PDF document text
    • http://whatdwellswithin.com/file/65679346619.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/6344544823.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608885fdc29f2---67087519202.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/38046135732.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/kejubulazokubudox.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/purisadekazojimageda.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d556d71270---97770126307.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/nabavajarejovifeb.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f9804670---jowuzakogofamuve.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_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90D 11004 bytes
SHA-256: 2c60692eee263473d375643b829aa6266f52c5e4f7c5428547f15fbe5771e960
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 22596 bytes
SHA-256: 20efce20a5a878c06110d23182f1e05de9d5640ad04ea72784fe2dfeb5167a2b

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