Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df7367ffcfe4ba4…

MALICIOUS

PDF

85.6 KB Created: 2021-10-05 14:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ec03de12975fd719a7a2dc3393c6c827 SHA-1: 68d37e53c5fcb502c693811a0c2d43df76a737cc SHA-256: 1df7367ffcfe4ba487d9de21f2ed0ac2dae36f52248e111cf3d6ff6b19830b2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://tythb.cn/uploadfile/files/68062939594.pdf In PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/vezafogoma.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/gojinojopetutaremilevovol.pdfIn PDF document text
    • https://computerzone.pk/file/legupa.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/46616740334.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613992e24c814---mezoxiteraxawapijoloniw.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/85871320385.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/51186989496.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/sjmjehnflsqhef1a0vlpac38fe/zenazubawa.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/44070585375.pdfIn PDF document text
    • http://sinostandards.net/upload/files/45470060362.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210909_003349.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/4196414642.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/32213933678.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614057c932a09---jiropikawa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613101c0315be---vawaredokejir.pdfIn PDF document text
    • https://ubranni.com/uploader/files/kadejijosufod.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nemozepi.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/runotevuwa.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/dubijikanu.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/35867206066.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/pebexubelorazufujukow.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/2189143502.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/9479222744.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/55567537443.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/85324551784.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/wodujadotimemixup.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/wofijitofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=catholic+prophecy+the+coming+chastisement+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_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 11212 bytes
SHA-256: 855ae112f50d100ac30f03981b0b85b551c1a50c0efe140354861cee40f27180
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 20356 bytes
SHA-256: 188f1428345c3bcc382f78acb4d869fdef03a03271c8fea8c5bce1b02232839c
font_02_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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