Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f6b789a244ed9d5…

MALICIOUS

PDF

78.3 KB Created: 2021-10-13 11:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9575ebc123e5240eb6b136d447a7f020 SHA-1: 6cb1d3a4af247406a19db3c10622e7de935c2114 SHA-256: 7f6b789a244ed9d5ec5d9a0446795f307a2b9cdaf5ed2ab1abf7178474a4099c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.greddy.com/admin/common/ckfinder/userfiles/File/xusufidapuxelox.pdf In PDF document text
    • https://hoangnhataudio.vn/media/files/sisotipafilapuzizi.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vajobaretopejomatoja.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144a09e2dc01---38157839497.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/dizadufewebol.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/wigisafutuzobugexek.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/3960609452.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/sepubukowevowunok.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/24939797382.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/lavojekunuruwokijukuga.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/ladowojibevufe.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tijofodijejurapekaf.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/zerurefu.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/8287c6903f1a1e79eca087dba6e88fa9/zavepexarux.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210923100337474.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/61342977705.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/32722178030.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/95215857670.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162d837ca40d---vezeni.pdfIn PDF document text
    • http://receptlap.hu/files/jidojatakozatupuduvodug.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/29123416184.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/57643252444.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/29916483737.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=how+can+i+reduce+hip+fatPDF 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_off0000ccb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB1 17752 bytes
SHA-256: edcad2d773289200551a03a864a0ce9b5b93db4af029911bb73ebdc62409feae
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001131d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 10680 bytes
SHA-256: 33f2b3f8b218dba82c493ceba902116bf1eb184c666240de589c3d6946038db9

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