Malicious PDF — malware analysis report

Static analysis result for SHA-256 c077ee12cbf4f75c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 11:38:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8b3079ce1b7f721151d230cc6fd2dc46 SHA-1: f95f829760176fda3b938e453c508cb88b4edc42 SHA-256: c077ee12cbf4f75c4557cfd8b17efc5f4ff2a20e96d25f59067cfeeff1da892b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kimtuong.vn/isc/public/files/fckupload/file/88467785170.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/mopenilisexeliriduwepoje.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/76424682750.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/febevoruxatapikazib.pdfIn PDF document text
    • http://banquat.com/userfiles/files/2890878345.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a348bc3783c---nazajagudadixetukaw.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/bovebiwuravuzizo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/04f569183cd6b90644cb1691c6ceaf11/34446000619.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/tudavixani.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878abeca730---58860488313.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/69833646836.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/52b0na2lr1992m6vq99m1v4b93/kuruvid.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/75f1ac8d6fa19ecb83d2d8c5cbd1ff78/visozuzupubetezateradug.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/wogoregovavaxoxabel.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/xuvoniwe.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/quuqt0khsiks2fn1rlsq6rkvv0/46382650858.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/dikitaguzorodu.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/rimireloxivenizupuka.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a843ef1cfe3---44514358776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=water+cycle+worksheet+for+kindergarten+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_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 17292 bytes
SHA-256: df1b1330acd0b549a1c68b92c73000c9b1ecaff00f2ed447b16d16aefe0e850b
font_01_sfnt_off000102ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CA 11184 bytes
SHA-256: 4e97b4c0be6a6df7b194b92f321be3e9a8d0c7e472b6d52e2049226565b081ac
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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