Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2da3fc4d5fc5b1d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 14:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: da030671b01f3998e7700b8dcb06b8bf SHA-1: c4d609f8e0dd6dcf2ace289ba5a3644576191184 SHA-256: e2da3fc4d5fc5b1dc5bbebe09f92ed0911abb575085f667527ce32f233029d2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allineers.morefriendship.com/upload/files/47561494762.pdf In PDF document text
    • https://altsovmun.ru/userfiles/file/89686598304.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/seperozotexulew.pdfIn PDF document text
    • http://geotersrl.it/file/bobuwoveri.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/8876haf82754jqb0msvtqqm1vp/32143644995.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021911325357166.pdfIn PDF document text
    • http://maulich.vn/attachment/files/vovug.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/50446921931.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/tatisotix.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/33569574245.pdfIn PDF document text
    • https://trieurodata.ro/images/file/70513945002.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/72850050982.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/adf93572f69e2a97bc05b687bf291c3d/fimidapadoribomasigazol.pdfIn PDF document text
    • http://01host.ru/userfiles/files/tanumifosukukutulezuziwo.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/bitabe.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/47534089226.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/d8e6aa3734a6279832560b8215cde40f/28043469892.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kumugunim.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/61852946045.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143482b61166---19805619567.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/danazupapes.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/41136917060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=art+filter+apkPDF 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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 18768 bytes
SHA-256: c3eddfb4563597b16621b825ad54311b7c4002c80298c6c414ea5a539192ac2e
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4C 10032 bytes
SHA-256: 694e02d739391f6a497b3fb8d8077a721abbd48162ce307051e997011820d25f