Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ae91948ffbd15c…

MALICIOUS

PDF

84.0 KB Created: 2021-07-21 06:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4629a06c7b241206ebb449eeec2c835d SHA-1: 5b54c203b077b020e6af62860f48c73044e3437b SHA-256: c3ae91948ffbd15ca001108a03a6090199f7cf8880c8b2eaebf9836ee0c1e723
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites using common upload plugins. This suggests an attempt to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hevolta.com/upload/file/21359917150.pdf In PDF document text
    • http://beergolfers.com./blog/images/file/lexofibaruguremi.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qh2or6hio9093mdh10c0r3mdsn/53872557698.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9874d67b3---74732324967.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/kokofufudekolidij.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sg59m6te3hfu8mqaa39chtstso/87737872137.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/81fc147a931c4130acb8b68a3d3369db/gejoxekibefaditon.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59de5064c0---70615653324.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/j2e1ob1vg5n6t8dk50qqjntocv/jikamoxawazekov.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/vavalijovodafabitaxiw.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/25172313920.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/tom43b528vmmphgbd8qse2ppat/20326660929.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5d8c0caeb---jumavavefatemaraj.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/11b9ed6ed958f56a5fbd9f69ff9886c6/dutekizudavesefox.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098b5f7d1cbb---35359493046.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607535e5e762e---zuset.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/gofisaxopase.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6966cc56ac---69711586289.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1b8505b0edeb2b3de972c9ee11cadbd5/wubusofi.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/bilumolewifatojipukibaxax.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b111da81b1---vekikikesidosonamogibafa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1634a9aa0---27317663036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vain+meaning+in+tagalogPDF 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_off0000e5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 18148 bytes
SHA-256: 139582c94413f72d6c61d7db50f4b0288afcb8dd4f69e78ca5a9b2cb112d39af
font_01_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 10152 bytes
SHA-256: 800f06f42737c4cb94d3cd5ffd1c2fd2a7c0a7d4dcd87b9405cc7bb4c6fe5521
font_02_sfnt_off00012b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.