Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c91526e73d45e7…

MALICIOUS

PDF

76.7 KB Created: 2021-08-30 09:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6a138e2b2de2bbd02878eb205dce2890 SHA-1: 7748f061f2ad222358ce47fd5cef884e389c4c99 SHA-256: e0c91526e73d45e7bc2fed4fa7ac606d14b60291a487c775d0565c70417bfec6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage and other potentially untrusted hosting. These links likely serve as a lure to redirect users to malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/364dbc59883faac7260dbb8eb3cc062c/95758578295.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/74e2493144f7b7d43da89396063311e4/pekukejasavefavokafivewo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/80001171589.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xijokomad.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4e1ba2870---5799846740.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b7727aceded2d1fa6a4bcf6bfbd086a9/xelojakibitipaxisaz.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kupowopesine.pdfIn PDF document text
    • http://abworder.com/uploads/files/xigizi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/412a5bd867c4062d91b96060ac7c5406/5623324907.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5ec7102027a9a9e436be7a2f16003c63/lupawarunifuziwegedobub.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/3494dd8ed60630751adf81dd7bbc1627/rebokipefalik.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/498f9b6f6e07fc1632fcd714e08e3244/31892841750.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/82980685592.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/79582738515.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/dokatipijodipobisiloririj.pdfIn PDF document text
    • http://rsst77.ru/upload/files/18796606886.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a5a15f17bda443409cd9608e32108928/wadekopunazukemuvewada.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860ecf2da9---26072960976.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a698fc6404c---moroxifibebu.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/74139084944.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2cd67fb9673c6874759a4d7ebe4a961a/14165538714.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48cfb80b5---wafedowinaxo.pdfIn PDF document text
    • http://jfe.hk/userfiles/18085680890.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b4329a31b52---98407378710.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/p7gp3cesh2gao97go2c27rhprm/giwezizagetebavudikemoda.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/jogibugezus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=adding+dissimilar+fractions+pptPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF81 16596 bytes
SHA-256: 5232dc4b4282ccd95eb547fe985d4316b5ac021a5cfcf5bf869ba3cad3fb7faf
font_02_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 10812 bytes
SHA-256: 46c202e5a13ca4265e9f38c67a9535e9d34a324f6236244d400146cada762d75

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