Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f00bd7cc94436e6…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 11:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 285034774d9be500eb46fc911809a467 SHA-1: 4508d0bb7e4fcfe1fe72b19df22884db6e54fbb2 SHA-256: 3f00bd7cc94436e6922f8e1e7fab2f3a5eb37aabd0a96df001c620f7ede4b108
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=21+jump+street+full PDF link annotation
    • http://darangyi.com/userData/board/file/diwusaro.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fce5cefdcd---42893782350.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/bedoxevejun.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3dade5d6053e8f17d8d993b63c0175e/66911130121.pdfIn PDF document text
    • https://olterus.info/contents/files/digonuru.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/nisejut.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/mosigagiroladix.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061252407483.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/93468790438.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be7619447---lipibukowumodimafijakapoz.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/wuxexemodelujipolavivuxul.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/nuxenodurilatafomafaseka.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/64001006654.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/babilixuj.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/nifarogufozakideb.pdfIn PDF document text
    • https://avenue102.com/uploads/file/35188650845.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/35260536962.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/1006678003.pdfIn PDF document text
    • http://bankerz.in/qpic/files/suvusexelupum.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89432427085.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/sunulegifirotopomilo.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/53792713321.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/fasin.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77768745617.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_off0000bb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB74 19540 bytes
SHA-256: c17dfab5d8e1b2022bb03fc4d61a33f32b36119ad0be886cc78515e96bf6742a
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 10348 bytes
SHA-256: dab303c99e0eb37c6a69a546f504652f79cd1446c33f2a7fabfb9881be214088
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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