Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca7083e358d0501…

MALICIOUS

PDF

92.1 KB Created: 2021-08-04 15:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2254b09d9b31c513be98decb6ac539ae SHA-1: 8f8bd5258f145494fed78285b941db4edc5a2717 SHA-256: cca7083e358d05013b07e6e6ca7efbcec6c964a98a84cb64bc98befc964bd9c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the presence of multiple links to potentially malicious domains is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfcedb620---jalokixagenibuvisatim.pdf In PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/53874a66456b72c14b5131b7204d781f/97908963878.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeabf54c16---wutuzetuloridoduwunoxawa.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/60556871003.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/58180176191.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/92621995973.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42c03b10f---25430490498.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/gazuwuvesefuginejeb.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/9177d2d0c88ed7b1d91ad602eabcaded/xiwurubekowatafutuxaz.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/5367487901.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/guzudugubekegivogowi.pdfIn PDF document text
    • https://kuepancong.com/contents//files/13937414847.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607649fe70e46---lituzewadezukofe.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/gozerir.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/78895205059.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/fdsbmnhug20i51v7hcpbcfhiog/xopomogit.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2faea135---vewatinepotad.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/12694177348.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c215e90ee---wobukutisuwa.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/92266914857.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/70298983911.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894aa1d010e---bulajujotivogifotofa.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6ce427f150f87c6eec87937f700fd3f9/91958976418.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/90830228610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=akhiyon+se+goli+maare+new+hd+video+song+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 18776 bytes
SHA-256: 3ded9aaca2ef9e6c6e95cee9882111b9cda0db582afcb602817e0619031ab472
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 17708 bytes
SHA-256: 2df52ced148feeab687bcb38e5951e736fc43c6701b291df5f0ba35ba1e3b38a
font_03_sfnt_off000145e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E1 10936 bytes
SHA-256: 238d9db505419fccbb700f82eabdb14dadbf925bb79d557f7c5196f4bb52f751

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