Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ae83018772bbcb…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 18:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7dec7898ab767fb19a27d74d23904bad SHA-1: 5aed284451e51881b3b5a54933a3c7a1eaa927c6 SHA-256: b4ae83018772bbcbc3f1c7ca59458e0e39b5fe4277d2a0847abf13dfadb4f701
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=side+scrolling+game+android PDF link annotation
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/dokavoj.pdfIn PDF document text
    • http://pk.mo/userfiles/file/26696550942.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/disasatigadigapakabugoxaj.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/pigulemum.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/nozizej.pdfIn PDF document text
    • https://tepihtrava.rs/files/gutegupebojidumagoxe.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/gipeluwapobuge.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/32743472097.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/tikisegolokefoxux.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/gupidogukawo.pdfIn PDF document text
    • http://chamdure.com/DATA/files/95300390645.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/430339975.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4c7997879efeb13f4e77ba4c529f7ab7/jumex.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/gurubolopi.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/35232863788.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/68070922323.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133713f9eb55---rojumananoxurufudusew.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac6511a1---daxugek.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/4331462742.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/xiwapunuberedep.pdfIn PDF document text
    • https://aksusu.com/upload/files/vidojabafoteb.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/52303074339.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/devasugizinizidufudopo.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/46512064375.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16146c46248409---49833629661.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/ninusejipediwudelozixopa.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_off0000b261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB261 17308 bytes
SHA-256: 0b336a7e5e0bc9043e887742f16bdd70403dfd281a3a29b14385e0e29c8ee468
font_01_sfnt_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 10688 bytes
SHA-256: 1696b5a47a44b4e2d222fc4179d5dda8238b253d05070b5bf895313e675a1cc9
font_02_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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