Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5587dff0242992…

MALICIOUS

PDF

332.2 KB Created: 2021-08-13 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 024c46dce94da27c3d179ac1ae0ab336 SHA-1: f709d8595bbbe41d0fbac8dafe4863fa7f71736d SHA-256: da5587dff024299291b8af7da37c03dce8a6ea66c333af4dd99a9477f834de94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via a compromised link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9119

Heuristics 5

  • 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.
  • 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://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096e513ac947---gotenotidizinasadoxejoke.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c853d6cb18d---juranafowu.pdfIn PDF document text
    • http://teresachild.com/upload/files/83000102560.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b5629daca915d2754c08d0cdc60c8079/nimigitipakefipafare.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/g9ovnj4bq09883odculvt05b0r/woxororilisojewusoxadezug.pdfIn PDF document text
    • https://wildnaturetravel.com/File/xibasetuteputujoxur.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/duwelusidaxuzenu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b4a92686f42c3786ba48eab280e7b477/duboj.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611512aea148c---6987513084.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083483098aeb---71104308663.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/wawuwo.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/paxuranumabamijo.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/61fdbba8fe36d9e0753b7236333fcae4/watijowexajitumigixofutav.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/zozaxokeno.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a757449787---41687068930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4e0c9ec0a---79804553393.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1f19d5309---botigun.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/52146568083.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/0bfcf4fb1246b24304fe3c2ea229f68f/jaxetefetowelasokifa.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dkk4pp6i4erp7ijshc5olotem4/xepewamori.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ggv7ek6musvt680ro0gr39m92f/vawuxibakesibapiz.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/56182202186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=wartsila+50df+maintenance+manualPDF 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_off0004b625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0004ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE3C 10868 bytes
SHA-256: 2dcc1974009eb48f7ac8ba76be960fd2f78a4290f17fee49f2de4324279d08ad
font_02_sfnt_off0004e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E760 21064 bytes
SHA-256: 6fff47cea562528c3bb01419256ff017a069992472708f3ffb82537da1eaecc0