Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af3521acae71f6b…

MALICIOUS

PDF

94.3 KB Created: 2021-09-04 13:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3633b6ec71518a3dbd0f43049f4d4eef SHA-1: c4af7a319fc9abb3e9fdccffa1f69333191e2315 SHA-256: 3af3521acae71f6ba485caade9c8d57670df251a6823093f59d5ec2def6c4650
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://genegurumiraclehealer.com/userfiles/file/jazagezufidosalikudolileg.pdf In PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/paxolepij.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/05774a25a88de7159bddb1076470b3ee/69829855617.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e045397e2ab---10377434480.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/fuzovali.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/raxiwexesozekatubi.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f71bc390e---tanaperar.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/67675670022.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/33eeb803d5a9f9ed36b5a2d4c5e29d4e/mazev.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/73395740004.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/48106734253.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/a04e48cf0ecf1a37769434489649fb1f/volivuxizufi.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/42751639038.pdfIn PDF document text
    • http://yilip.net/userData/board/file/barorodemew.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/9n9u12ivnlh30hrnf7djkgu78j/talexibudufo.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/66422395162.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f81e2e419d---jogukipimokew.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e009a2e8bc---sevisusuvijejikadi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/291ce990478cf07353b1c99e7d2a1fd6/xuwadi.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/zegivokuluve.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5bc92e513---75113254792.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/ralasodazanosojepejixe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79756b9cdd---mudenemam.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee28891637---bininilime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=modalidades+e+tipos+de+licita%C3%A7%C3%A3o+pdfPDF 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_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10868 bytes
SHA-256: a395316e0b11ce7463f9379954835eda51123b4592953b245bf3c228099024fb
font_01_sfnt_off00011c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 21404 bytes
SHA-256: e2bacf0676c475ea3778e6ed344326fb380c26c26cf6c69288acdf92cb71b998
font_02_sfnt_off000151a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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