Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33078a2decd5905…

MALICIOUS

PDF

90.3 KB Created: 2021-09-08 00:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef4fe44665ea505fedc2efc74cb9bd32 SHA-1: f68ccfbd62b7569623ca5da17cd88d9b131595c8 SHA-256: d33078a2decd5905a9e012cb991e3fad2c18008c637d38ddd170be36960b32aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=the+crucible+act+3+irony+worksheet PDF link annotation
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/57561634403.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/topezixapubofulanixefaw.pdfIn PDF document text
    • https://peterdegendt.be/file/74192897697.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q8cvsbbl8bo1gp2uhhmna15mvo/37533723675.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080decdb7dba.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/manoj.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/gozot.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125b27f2d049---buranetalesopetawolari.pdfIn PDF document text
    • http://msiutilities.biz/documents/59458354328.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/8511829803.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/9paeiajah5t39mih6cko7pn6k5/jajobonarazevuzusizojo.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3601cc4f8---ratixezemod.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bbgio50fmkb0r9fqlrj8npr1ef/kuzobamuweginulisiwebid.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3362f912b81ca7b7084c2ac4dd9ce2ca/91032194449.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/95382361452.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210624154254.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/27688330634.pdfIn PDF document text
    • http://bdn10.cz/files/file/gujomejavudomut.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/37516924199.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d200e38e43---3308928555.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f5868f9f8e8---56694317646.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents//files/wudezulepena.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/jenerofugisuwotetixevuz.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/61422842208.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/rapijeraxelakijuzat.pdfIn 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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 10996 bytes
SHA-256: da2d7adb33fd943136e95b54c32f7ddb1cd833f466ffe7b1a5872afdaf8cb7a8
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 18504 bytes
SHA-256: 87d1b157a4f9fda9a379229316ae15064e2d6bb8f7ff7f02619290f077e507d2

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