Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b59d53b6ffaede…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 11:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72d31abd0aed62f3803b9c3d0d30594a SHA-1: 23fdbf3873bd9a518f7c4a0c8959f2e98a9e7202 SHA-256: 26b59d53b6ffaede024d9278c1e7e916efae5770a31968fef139d99d2a80a99f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/89282006327.pdf In PDF document text
    • http://mnogonomerov.ru/uploads/file/gowezepemiwodafogapuraxi.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/mupevumupukepavidekid.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/cb38b72c21c4c0c9aa9abbfdbb5dde58/jepodokimixuxafe.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/96786606757.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/27963864371.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/dajomaxukegogi.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/reboxenexujoteri.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/92879260545.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sujurevajozotitodododosel.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613628d7a6951---zatenerirafogag.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0902/a7e95b9ad3acf6240928e918bfe7e317.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/53921926774.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/nageluxumab.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8455367c9---rubagimenimizo.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/45030205302.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8ffd62b7ca1df39a4668d1e74ae5802f/fulegetigevix.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/84905843606.pdfIn PDF document text
    • https://fptica.ru/images/file/wuwofesufigafusu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/77222305611.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/rezolagivukezebedi.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/kadiwesuvigojipomunuvoden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wifi+hacker+app+download+apkPDF 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_off0000b9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A6 10620 bytes
SHA-256: 7b787dafc9ebef0a6ea6b6b5f4fe171f9d1976b739655a0a02880732d352ee38
font_01_sfnt_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 16472 bytes
SHA-256: 21af74997d94871cd8ca1094622e8e9e0e9dfc42fba20d9ce29fd74bd2c2f301
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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