Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ee51a0dde350a9…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 10:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 100e1ece8b1dffc98e6519ca160aa1e0 SHA-1: eea0aec0c7d950595e27d7027beaa48362659617 SHA-256: e5ee51a0dde350a9b3545f75a6daebb1c9d4881a6b726fde2a0fa162e30b9b46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which point to compromised WordPress sites acting as a link farm. These links are designed to redirect users to other locations, likely for malicious purposes such as phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/58d468d8ffa7a6bd45ba482338b6c54e/dolezefu.pdf In PDF document text
    • http://takramaipai.com/mypicture/file/lusoxexorodafelulimuvipok.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/19422628932.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/91748138742.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95878122793.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/52147891220.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e938ba5844a---72198343692.pdfIn PDF document text
    • http://pronobile.de/catalog/file/33009322517.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/d27gq858gi5rnmv58tpoj30ov1/32876689699.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d50d7cf9e71bce17f41a3319d4bd7c74/32355286754.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/89041147535.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f09e97c534---62024731073.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160884f25dbe5b---lowemipaxo.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/97824964976.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210605150708.pdfIn PDF document text
    • http://maihome.hu/admin1/file/54143539713.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/bureto.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd95822b33---17421229843.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qkt9dqpus3f1dd4taqhltephc2/lojonarikurebafite.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/fosuw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924a00d6059---bofatajixumomitan.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/77u8c4a4jmef1i53ccgte18bf8/14713540130.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b4e4c5a---26814177438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=manualidades+con+tapones+de+botellas+de+plastico+para+ni%C3%B1osPDF 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_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 10948 bytes
SHA-256: f95ac96c812bc014969d0daa8cd27fe8adc2a18ccd72d8f3338eafdc8bc5975b
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 19676 bytes
SHA-256: e3ef4e11d5d052ea812ed858a46649550c02bc682071a68eaeb078d78f1094e8
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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