Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbb1c88b9e61500…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 12:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d0d903b24ce106fd0d068a195497931 SHA-1: 9557195da97cbe8d71cd4cb449c46e054c1bf14e SHA-256: 7dbb1c88b9e615001bf05072c4ef728ac3e692d66b368ff8f4b3f58203efbd18
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and compromised CMS upload links points to a coordinated effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=you+reign+above+it+all+lyrics PDF link annotation
    • http://ordineveterinarivenezia.eu/userfiles/files/dopifokagebemejup.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/zadabidame.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c69686f4c008a29b272f10f122b92c9f/malamudoxuxemilalafaze.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e10af609889772273a907d04e0494cca/96903364392.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a6a9f35d8e662a2bb4087704e9b8a219/90884069698.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/51444797966.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/8419025076.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/nopavegolamode.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/100c09eefaf7548f7780f895055bdff3/sevebe.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/worezuxipasegajuf.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/66316078729.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4c55aac50c15ad96bbc15e612a157be1/rinobojegu.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/zojatozinaw.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1610f226ee4905---nuxikuxoritetiw.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fd754c917152ca451c563bcd88d5bf68/vutope.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/juxapuzab.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/80705444804.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe45d3c18665d694bc3358e0924484a7/pukelasif.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898ba637c17---fisum.pdfIn PDF document text
    • http://drironcat.com/images/file/jowito.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bc40d23970---puvunupisok.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/44541148269.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/murezukiputofuvukoxinadu.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10808 bytes
SHA-256: 19eff1a9decd83b06868ea4dfdf7b737509aa9f4e3b4de4b07c802c203c705f6
font_01_sfnt_off0000f06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001087c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087C 17796 bytes
SHA-256: 1d208e12a5a5f6cd7d1e5b9df2df015bb45cd69c75c54a3b3d0b664739629e35

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