Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7371f7d2f32a2ec…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 02:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 81fc871ba488969448cf5ee1293b5b69 SHA-1: 0aa4b11a91cc69d9bf26b3f23e8dd2deb916b7f8 SHA-256: e7371f7d2f32a2ec63d6b7a194089105fb8ad697b2219855a09a6f80f1dec6b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised websites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicates a pattern of using compromised WordPress uploads for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/xazatixiwafitow.pdf In PDF document text
    • http://aite-materials.com/upfiles/file/fikukekago.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/81392492708.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/simimunopuzarema.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/lalalaxilimifewosijinu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8d14e5b35e6ea1a85cd7d56ab4cea6a4/78492295563.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc22e81c91---86706374296.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bdf5e52dc3---xonejuka.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/ladogok.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0111b1f286---13903338967.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/5a2816c2a2e3290989b23120df674f56/fafugin.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/wewipe.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/nimos.pdfIn PDF document text
    • http://szpk.hu/_user/file/wudaxejiponoguruv.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/ditatugekemupadigojokaxi.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/17185388679.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/32a0daa7f346f0e963655dbb786988ae/40638234370.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610da21a5ef15---pupozad.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/31386853183.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5ab7ede94---lanagod.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/pewuvanagekamobixa.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/21637457762.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/42237874754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=photophobia+and+neck+stiffnessPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 10804 bytes
SHA-256: e25efae9148d6ee4e180bb021ffae7f60e1747231e4631c6ea08d31c4c62dd02
font_02_sfnt_off000116b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B5 17448 bytes
SHA-256: 5096c55d0e510e9390ea03388ef53e355a37645aeed88bb0c84f06f9cce6373c

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