Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a0ce85f0d4d285…

MALICIOUS

PDF

98.5 KB Created: 2021-08-24 11:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7ffc739cd233b7a5dceb622b27f71a23 SHA-1: 38f750bb040016dbc849164f7d574d5a4019f139 SHA-256: e4a0ce85f0d4d285f75c267870390a54e17ebfb50c0e9138bf00e935b2fa23ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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 http://karate-talence.com/newsite/userfiles/files/fowajovu.pdf In PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bdea9cd2d---zoxeropajadixunexepofafel.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53db8c3d5---76760326357.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd22ea4af7---24373284804.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wisuf.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/pafekoxosepobok.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tatezetefitemoxuseg.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/nukaziriguda.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e957709a8---77856767019.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/73047893122.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/pudebi.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/os73ars73m6s40o7tslle96cn2/zosewut.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/misaludivuvifunijiwu.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/52866254167.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/vupanixiromomevozuliniw.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e66e4f58---19097619663.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f47ebc94b---ruvufiduf.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/vuwolizaxajur.pdfIn PDF document text
    • http://nessium.net/userfiles/file/mapisupojurefijimupoxewo.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/zezigufowamovato.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/8405528455.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/mibogulonum.pdfIn PDF document text
    • http://sns.hu/_user/file/nixumibikasufi.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/bixamebibinegajov.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16076d7354a620---29813806076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=weave+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e4cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE4CC 18288 bytes
SHA-256: 64e6b8b35e2726fef10f29283343cfe8276249c9feb3fd5b9c2da356a813c4ac
font_01_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 23776 bytes
SHA-256: db0795f280466bb82cee1aa5c2eb03693af3f7648c0cf86bdc441c9397ba0faa
font_02_sfnt_off00013ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCD 10296 bytes
SHA-256: df8f5e7f68879719e71485fb47788406f540fe10a71f4ae094da29d6bac4b99c
font_03_sfnt_off000153b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B1 3248 bytes
SHA-256: 25509db634cf7507a4b8c644d718b9255754ef0ff9ec70e5107315eac97e8b15
font_04_sfnt_off000160d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1