Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd377764debbdd78…

MALICIOUS

PDF

148.7 KB Created: 2021-08-27 06:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17092625dc40850a60482327847b32e0 SHA-1: 5381b54f591abbc2818c6b734fbe71347b4c0f66 SHA-256: dd377764debbdd787a193a9e13f7b922489f7f2c0747af920b79f4347c207ebf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination and track user interactions, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://infrive.ru/uplcv?utm_term=scripture+cast+your+cares+on+the+lord PDF link annotation
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/16376447294.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/rokufimidedabuburede.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706d57c7669---vosexip.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/konusipabiza.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/zigadam.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/52977768724.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/sinegebelokokafurasikenu.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/96897423110.pdfIn PDF document text
    • http://allycatering.com/userfiles/44005615165.pdfIn PDF document text
    • https://ikansambel.com/contents//files/keriwus.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/47533568842.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k6jr9l9hkeu2r2e02oishcsjip/xutebarutazapumojudos.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb4a42b008---mopigawadovosewafuvagu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daf3474d09e---pabamenofujoku.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/42253501457.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/52402988260.pdfIn PDF document text
    • https://bloomeng.com/uploads/mikar.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/3016586766.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d28489ad4b---84091822551.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/98595642657.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9254b3c57e---75101701518.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/926b96b4101d25036d4c7074afbc16c1/gutasemagonixiwisemire.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c528e61b5a3---81821335709.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1864d4532814f212155c9944f99a34d/pibirilub.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/9438191327.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001f306.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1F306 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0001c1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9E7 10900 bytes
SHA-256: f25edd63a8c8db9a8c05b9f19837409d4e644c33593710209d74c3e65467433b
font_03_sfnt_off000208f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208F2 23176 bytes
SHA-256: 60af8919ab82968a3175c999fa1893a7dfb628d0e88bff0aa954368a4873a1b5

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