Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e92351d4ed5e733…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 20:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c260fd6ff39d38dc83bb4e15a2c5e16 SHA-1: 7b2b13fd341964e0acec5deef811a533b1e8db82 SHA-256: 1e92351d4ed5e733b2d0467b6e4ce75e030b22431ca36968a5ccfe44407760a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://rotang.net/userfiles/file/64177450657.pdf In PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/dababexavomugetezilufas.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/84271401622.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/8lk5gtjp54kd1eonqs16sejasc/40256819777.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/22643476444.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/54351004928.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f6acd88b---95827915094.pdfIn PDF document text
    • https://lecachet.fr/docs/files/tulubaredif.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/4806695582.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/48592886367.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/61569076777.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/dajaluxilatax.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/24481178813.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/60010322996.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130686ed4dd9---videzogitukuzojefapa.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/supida.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fupego.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wenumorepegaxani.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/reweboxulugi.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82409922454.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/misuwusi.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/noxim.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/810918170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+prevent+app+from+closing+androidPDF 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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 17148 bytes
SHA-256: 7f74640193bd41260d8d94af422e9b841b2c432d70c8cdb56636626dca0a3543
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 11108 bytes
SHA-256: dca85507feec7bc4beb85e444e850931839d64892184a3fea3dd720ffed5e42f
font_02_sfnt_off0001091e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.