Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff0fd75c8ed4cbf…

MALICIOUS

PDF

72.0 KB Created: 2021-09-16 04:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bbefb35d9cbf53c37a1479dc630e61f4 SHA-1: 15c1a5c5e080ece230d64c0f7299facf449fed6e SHA-256: 7ff0fd75c8ed4cbf33b2f395192825f75b8acc425ca843c4af860d1273b09e1a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to domains flagged as link farms on disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. The embedded JavaScript is likely responsible for initiating the download or redirect to the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dayuntang.com/assets/uploads/ckedit/files/20210908091521.pdf In PDF document text
    • https://hunghiephuylog.com/upload/files/84251327942.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/93258934037.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/zegabivuretagamuxafimas.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/xedajaru.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/coniek7ccithfb5egocast6bug/noluk.pdfIn PDF document text
    • https://telenovella-bg.com/files/59917687596.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1974ho5oijfcfdl0tulsponog0/dekifu.pdfIn PDF document text
    • http://wirheiraten.de/images/file/2724934666.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/97111920222.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/poxorova.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/41653189854.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/10523936948.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/tafaxesegenujusor.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/92621459180.pdfIn PDF document text
    • http://delve-cr.com/uploads/70553021864.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/80590703182.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/votuvuvowazugekolanoluve.pdfIn PDF document text
    • http://medi-sen.com/files/files/gupifulefepup.pdfIn PDF document text
    • http://someteme.com/archivos/_20210907033136.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614170522928e---nomareteruwozut.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/pojusosotimibosenuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+emulator+browserPDF 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_off0000b6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F2 16732 bytes
SHA-256: 95f3a98ddee87b14e92205f4b0e11a84f1b5f8bf8a52e9ff5d377bc27f4e6822
font_01_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 10596 bytes
SHA-256: 4657c443d7002f9678248fa4227d553b4e790bfe12e5ae0ee966b48524a511ac

Open this report in the interactive analyzer, or submit your own file for analysis.