Malicious PDF — malware analysis report

Static analysis result for SHA-256 b661fa8649b2971a…

MALICIOUS

PDF

107.1 KB Created: 2021-09-18 14:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 94b669366101f634710c5b786f5b2c31 SHA-1: 8d65013155a611bb9b9418afc8d64f74ac50415a SHA-256: b661fa8649b2971a29ee85385d35bd9ba5f0ecc71794059a3061ce55e00c9fd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Embedded JavaScript was also detected, which could be used to further obfuscate the redirection or initiate a malicious download. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=gaming+tools+game+mode+gfx+tool+fps+optimizer PDF link annotation
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/88395925840.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/44572258894.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/25024660096.pdfIn PDF document text
    • http://pasaru.com/upload/files/poragisidopofa.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/mazujupositujabemuxikufu.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ripozela.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/wunokusutaxomimibododovax.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/xejigizudiritirog.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/sipud.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/pigibodu.pdfIn PDF document text
    • http://ladna.pl/user_images/file/musakoviwa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jt82vt9e9ioqgsebbcd20845v5/wumagubazeruwipalodudavum.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/93493477063.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc58ac17bb---97386682153.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16306147241631.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/javaretofugidamuguku.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/28416012391.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/rojipagad.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/lebifemanabod.pdfIn PDF document text
    • http://chicopharm.com/upload/files/tadegodekine.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037066c152---bunigivitusev.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/19638477933.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wikudanugubisa.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/ruxunapidawe.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/dusiku.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_off00013bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDF 11040 bytes
SHA-256: 0c4d221aa7d710d8f4be6616c47f8ca58ecae1fa01d5fa4b0a89ebe03f3ac3ce
font_01_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 18456 bytes
SHA-256: c6d6485e96a562b2b9a81d533d221f0d2f44fa7993a8340f1d64f45759521309
font_02_sfnt_off00018655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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