Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d22878f7e78607…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 09:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca94a63eeeb8b0e0d924d336d206d71d SHA-1: 77865c0969ac1c21be22f0133c3e01667046837e SHA-256: a9d22878f7e78607146fe9b346210358586a18091141eb9939e13a6456a0c5ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://catamma.ru/uplcv?utm_term=super+mario+3d+world+on+android PDF link annotation
    • https://birsamundapark.in/userfiles/files/ropozufa.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/wapabimebag.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/nodim.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/doviziko.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/begurupelategi.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/nafemigevokakodob.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/56199447587.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/32280548406.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_F2CA08A0CF443E0E.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3bb8bf37454b7b11b615aafea494219b/14850954724.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/17611692512.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-9/20210909044914272718.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360a7339afa---josanukuzowobud.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421aded4a7e---19783209140.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/mavamunubanuwulunimibiku.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/dejapimozepufaxisemodat.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/14307295883.pdfIn PDF document text
    • https://linker.tw/files/33857688697.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/42328292059.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/16397434533.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82940359615.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/16982283509.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/lavatixidibine.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/todomupiforumopijegenar.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/14253568671.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/46c3d7eda2346883ff71c7b85c74fdd3/57511571638.pdfIn PDF document text
    • http://cftckr.marketsearching.com/upload/files/5390862589.pdfIn PDF document text
    • 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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 10720 bytes
SHA-256: 9cdae1c51beabe27028ed91fb1bdf8ec7c166b697c356dbad3f21e62269a1a47
font_01_sfnt_off0000cca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA7 16528 bytes
SHA-256: b8d5bbc9db455ab3d2f80dbad4a7387f00f64532e4ef3cbe66778c6239fefb7b
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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