Malicious PDF — malware analysis report

Static analysis result for SHA-256 955d54578bb72ed2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 05:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95ca283a99a35ac852d138a0d8e014bc SHA-1: 0e6c0de4aa44af2f3195b55bb434d52ba47e110b SHA-256: 955d54578bb72ed2ec2fa74fc177e3c3368b6602be2429bc69de778ade0a61c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lamekatus.com/uploads/ckeditor/files/zewigefamedageximijo.pdf In PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a13b23f91---93607921790.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0015897001630928307.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8dd0b2f0---93568469108.pdfIn PDF document text
    • http://newshop.jp/archive/file/6407752960.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/xutajuba.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/jonogeje.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/xolojimelanadu.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/71513359720.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/32774771608.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xonuxijofitejo.pdfIn PDF document text
    • http://consade.com/userfiles/file/vujizezenoduvo.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/97864925065.pdfIn PDF document text
    • http://szpk.hu/_user/file/63087206478.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wonuvatepimipezisup.pdfIn PDF document text
    • http://lex.tj/img/file/38222773660.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/tukosukuxos.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e1592d806d63c407917a9751dd22b9fb/9156487117.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/bikakaworikumodefedew.pdfIn PDF document text
    • http://enricobarraco.com/files/peduridasagarawofode.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/37054285928.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/dirufevonubazij.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/loxibukemifefiwagitazudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+soccer+live+streaming+websitePDF 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 17476 bytes
SHA-256: 045f05cd80844d4bac0c4ba017db8eb1318a5e4ec9f68abcefe7dc536b580eba
font_01_sfnt_off0001082a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 10844 bytes
SHA-256: ae2a090fd45d74f127668afa0175a490de6f9d4d2410419ed96f90a1fbbaa041
font_02_sfnt_off00012143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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