Malicious PDF — malware analysis report

Static analysis result for SHA-256 495fefefeb12a944…

MALICIOUS

PDF

64.2 KB Created: 2021-09-16 02:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5950673604d41f8047ab36171d34127 SHA-1: 953162748f5e348321b240640d5555f969ff1125 SHA-256: 495fefefeb12a944e1f1c4ca78c9a77698ca76a9e68de4afa39cf40d1d1cf9cf
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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.
  • 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
  • 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://irlanc.ru/uplcv?utm_term=how+much+to+unlock+an+iphone+11 PDF link annotation
    • http://eros-arena.name/eros/userfiles/file/zopevatoposa.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/24900550769.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3091eca3d---poweloko.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/puguzutew.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/49966381999.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/20864848125.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613837f7dcc04---49802618852.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/79519746567.pdfIn PDF document text
    • https://allianztc.ro/files/file/kelinasuzimibi.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/46379609267.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/91528013440.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/53701517014.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/24444701798.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/gobivigino.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/40670200329.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/vukekejajijud.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/modezilufubirasedi.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/kemisavufekuzesudamoziga.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/96629808076.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/nemodijuvi.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/53418142237.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/97042275616.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/godakuxoxugodox.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/96580619213.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/2025968865.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D6 14732 bytes
SHA-256: 8bb4fec00d2d03baaca2f1ead6c85d507df9b94346b941b0269653fa4a0f7ee8
font_01_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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