Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e99747dfe537c6…

MALICIOUS

PDF

153.7 KB Created: 2021-07-07 01:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 15c27f0fb161575852e334808cbfecd4 SHA-1: 1c3eb3ad8e72cf7d92039fa9176f3d6894781a96 SHA-256: 42e99747dfe537c6781d114a64e1ba8d99fef2ae815e992300fcf72f830b8a28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9561

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://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e9a94878b---71193189531.pdf In PDF document text
    • http://0vote.com/ckfinder/files/99244130848.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847052b82f0---pubufuzotemewo.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/mdgki3m2cc8n58i3n1ntt1ed21/gusamixinezoruwoxenumim.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea83e80f9c---47774906446.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/92985486430.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/76285063034.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d7064297---babalikowufiwekuxavifizu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/purogefuxovovewusu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/waniburorujuwo.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/pomexumusamevewugogej.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/8192104146.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rekovu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63ed9f2a57---19036965021.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0f9e5646---22103886696.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78872445d5---45055775810.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec115b9377---weladazor.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/70017e41e288a5bddf2fea32adf3da72/18294900890.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6fa79c10dde09dd7133c5a46f2fda80/38451413341.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kobamamab.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/66899123226.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/36f8b3f96f4b21a42b61095728f53a75/69969108488.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609846ddd33a0---kevew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=lyrics+for+shake+it+off+by+taylor+swiftPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ceb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEB1 18008 bytes
SHA-256: 5ed1acc6174228f624d1079fc695a86ba352a368db3c758f89265b4dda481bd8
font_01_sfnt_off0001eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB09 20252 bytes
SHA-256: a9f6c6c2514471c9bb7ac579d293f09b690eeedd778cb1d36b37c6a0dab3660f
font_02_sfnt_off00021e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E6B 10720 bytes
SHA-256: 9d8d18fb47f42faba97b1400abb441445d420d7eabf6f84f98a43928731e7284
font_03_sfnt_off0002374c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2374C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00024f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F59 1856 bytes
SHA-256: 184a936bd1ce5dff700adc4e6a12c67a52a21ba3f6bd4f31defed58e18ed8b92

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