Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f22ab79c12ab5b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-24 08:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b181ddd0ced3030217e2724493ff52c SHA-1: 4d7c754bad3ede38f884910ac75aaf3e711e296c SHA-256: 84f22ab79c12ab5bcc3b68e19386fbb58bd215ac2e38f5c5d5bd39b2b7c78d0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites or disposable domains, suggests a phishing or malware distribution scheme. The primary purpose appears to be directing users to external resources that likely host malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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=let+us+c+by+yashwant+kanetkar PDF link annotation
    • https://bolahijau.com/contents/files/pabexujutifakoto.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/wupinuxip.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/66766828281.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/39194526854.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/tipuzikisod.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613654de6c747---57793553018.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/fenomigakifemirexukofete.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/nelixoxiwivosupi.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/fasuwigokedul.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/97042156595.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/wekozixuze.pdfIn PDF document text
    • http://coachhouse.info/assets/file/99950271353.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/25782318074.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/80908336011.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/gekiverovo.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nevizuzinuxukoxesumi.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/23540524506.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36ea7442f6b082149411ac96a5713202/53260047378.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/43598310824.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c12435b8c---71861712743.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/rorajopur.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/27158918385.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/lupapidowoxigeg.pdfIn PDF document text
    • http://helix.chuing.net/mai/ckfile/files/rorixabanolemafepabof.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/58963172768.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/powogeturut.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jedolazon.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_off0000c49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49B 16152 bytes
SHA-256: b6a683469710f44a4cbf5f69d0684a226d13480aa8b31a53c90fc0bdeb03540b
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10560 bytes
SHA-256: e3a873767f5d539e381dab722c1813d5017e419b5e2bcd9d454eddda885c34a9
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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