Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f65fc08597c7655…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 02:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c95b65843ef13b845e1a7d1e7abdcaa SHA-1: 1ea220b7c1e7b31b4c3e2c362fdb69ccbe23defc SHA-256: 5f65fc08597c7655ca6c90ea6d221bce9a8fbca9c1c67c0350aa76aee9e66ae4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also exhibits characteristics of a link farm, pointing to multiple external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dongphat.net/upload/files/78417329821.pdf In PDF document text
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/5vnrmst9928ijnqqr0jbiv46ec/butijegikadopilu.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/gololen.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/43423532258.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/192f374a1efdcef8bc730077d924130d/jagofiwafinopuwagax.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210914061659.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cf8d084f1---luvakipenukidizetanebo.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/ridudiludiz.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/16725720866.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908213834700753.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xixomekewolaborevalab.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/vubuvuketarixufigef.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/46594796472.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/nujuriken.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/76272328484.pdfIn PDF document text
    • http://africareview.in/userfiles/file/83521257156.pdfIn PDF document text
    • http://anninh247.info/upload/files/54787198524.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/berikorixu.pdfIn PDF document text
    • https://korankertas.com/contents/files/piroroxifiwerelaxubegofax.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/kanegazolopugawiz.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23981677943.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/73455868636.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/uukp7cutpfndtisjndk6g9u1oh/jititepemofodiripiviva.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/kenotapokexuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=8+ball+pool+auto+win+iosPDF 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_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 17532 bytes
SHA-256: ca701349b9b0faef7fd5521e0861eb3100a7ef82bfebc0163aad9c189451cd5d
font_01_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 10452 bytes
SHA-256: d0fa700fb579d39ef814d52dcd5cb28c66800d1fbe42af18f9f4061a83fa26f1
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1