Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fef7f478b1c6d80…

MALICIOUS

PDF

86.0 KB Created: 2021-08-31 00:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eaeb955a63e0293a36800c0ad9c27a63 SHA-1: a1fe2e6d088854d29e225e0e4c108573549cfe8b SHA-256: 6fef7f478b1c6d8041f3057be35dd3020c232c8c82857e3fa8334c67195ece3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The document contains numerous links pointing to various domains, several of which are flagged as compromised or hosted on disposable infrastructure. This suggests an attempt to lure users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://romento.com/uploaded_files/userfiles/files/nelagurireg.pdf In PDF document text
    • http://studiofagiani.eu/userfiles/files/vejenafogodofepenogo.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/jusofovegiwetedavuxodiduv.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vukupapa.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nezesikabazuxo.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/tufazanixolujaxabojon.pdfIn PDF document text
    • https://sambelteri.com/contents/files/bujexomasukuligamapufo.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///kazetelewijubage.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160864a228b67e---fukabajisa.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da737ad2039---45804296474.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8211d6c5e6---50083775074.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607776cdb8224---44403248010.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d9f964348---bitaz.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/23399449012.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160986d2754df1---31350869556.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073776b47ec8---97974629594.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xukesap.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/17506010721.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/43323946591.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/91242615941.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840cb1ca96---pokawizavuvurukezib.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/rojafuzodeb.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/68955853463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=postcolonial+reading+of+the+tempestPDF link annotation
    • https://en.m.wikipedia.org/wiki/The_TempestIn 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_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 17836 bytes
SHA-256: 6abd4d5a7230dd5ffd3a97f47405fdabc25aa40c1953f7769e40ca2f85860109
font_02_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 11068 bytes
SHA-256: 1cecb815793917a62b89c393416426d19bd1f4e62d56170849c2b71daf658638

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