Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98d5ef431d093c1…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 13:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 287bcf9917929e456839c6e902f7ae00 SHA-1: d99f677c8113ce1f86d5ded04c3a08e723ef7bd8 SHA-256: b98d5ef431d093c123ad38801ec5061746a684758c761a864d2547cc8f4c1044
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, containing an embedded JavaScript stream and a large number of external links. The links point to various compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=how+to+connect+android+to+mac+via+usb PDF link annotation
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/437f7cbc1f069a57592bb5ac1fe7eef8/naruwefikobenamewoxuvu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c3cfb16---87937194180.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/76173588477.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/93848174990.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/79086578073.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/20840003894.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c7dceb1---nolas.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/14393129559.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b36c087757---98521785514.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/jilomoj.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/27495210436.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/25918895059.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/1632529815.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485b496c3be---86532135291.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/57435454979.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016113594.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/30951025433.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/mazevezasawuda.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16143640c3c94d---98563143172.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/23825681869.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/rufuxutazetozititanutos.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210919_223458.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/ximiboforujenu.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1631085848.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/82882110111.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_off0000b15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15D 14384 bytes
SHA-256: 092a99410ab4f00f977ef9b41a5cd60a849251f1e3cb265b769a1aac69c07645
font_01_sfnt_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 10868 bytes
SHA-256: 8442cf23f2295a1d09a80da957912a0480205ce10a592286b3558b6d5cb5ecba
font_02_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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