Malicious PDF — malware analysis report

Static analysis result for SHA-256 623bd2b76d77f325…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 06:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 167a75ca5f46655b70d8506f26f77cc6 SHA-1: 74e0fdfdcdf10a551d7731a5639d51f51907bae8 SHA-256: 623bd2b76d77f32544950f29a059e448ffaff7bc4c7d2aa5cadd5faf47bc9b11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=microsoft+internet+explorer+f%C3%BCr+android PDF link annotation
    • http://villaelen.it/userfiles/files/wodaji.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16207852762.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/4387107149.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/37840563109.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/xixasakededuva.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/rafofumi.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/nebixazenuti.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161407ece6a90b---49236933710.pdfIn PDF document text
    • http://scsytech.com/upload/files/15262897291.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/22234702063.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21b6940a5---18611431226.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/witizu.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/liwonubipoworuza.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/7838839484.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/57165673209.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138bccd127bc---10930883905.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/logaxodobobiz.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/davoxusugizi.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///dubefubuxigoxuzab.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/xodegoroti.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/godef.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/70404864590.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/67459203663.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/poboxopepituz.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xobexujivezigemotuzukab.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC323 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 10900 bytes
SHA-256: 2735a8dc02e6fc64ade577b5acb1ba9edfb5ea045c7f57ea116403d6c04995bd
font_02_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 23876 bytes
SHA-256: 40b738d6ea29a9d9fa1b04a71411b3a71946f2c60d4c778fbe1d9f792d711d9f
font_03_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16376 bytes
SHA-256: e9b9545b8c216e91355ca2044c2858a40b0f9a5d748bf804a4f515fbbfc143a5
font_04_sfnt_off00014553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14553 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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