Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b517617214131b0…

MALICIOUS

PDF

95.6 KB Created: 2021-08-20 06:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07c79ec5cf5784dd4676aa4ee44dbe74 SHA-1: ee5fc6ac228d3c3f280b83aad3cf0253f3a00b09 SHA-256: 6b517617214131b0da54a99031554c713669df467dd31d5dc0d43d87b5ef9e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, with the primary function appearing to be directing users to potentially malicious external content. No scripts were extracted, but the heuristic firings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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://smidgel.ru/uplcv?utm_term=does+dish+have+newsmax PDF link annotation
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/84673948223.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/jusokuzo.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xadimuxejiko.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/85138816483.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/xinaluvir.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/92564115458.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/4dd2dca104e7fdae55bac771ad2962da/86582190547.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/pirokovodatadivel.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/8640388106.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/90i4o4rdbpi4bivfn1hlk0g9ve/ziminisenese.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/74178296360.pdfIn PDF document text
    • http://weingut-suppan.at/files/9081160751.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8o445a5bapds30boctuio9dq70/66258281739.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f772fb72569---ferol.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/bamurufuvamanatamudu.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/danifixunopo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0c1800de4---636009162.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f473952077---25880853393.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/temaza.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/91719399312.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4acc581a1---rakovil.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/86910c7d9c844751ca664348acc5c3d0/7081902684.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/padajivomar.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d0fc1774---62520220807.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_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 17280 bytes
SHA-256: 9e079ba942b215729a46280b11f4d288d500f803355ab7f63003c6941136f642
font_02_sfnt_off00015811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15811 10524 bytes
SHA-256: 9770ce31b73bd144b0803f60415ee3d40de1c6fb4a077a78914ebb6a201769cc