Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc52cab04656dd1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 12:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f00d1da133a271f69216c7a72763432a SHA-1: a8a50bb7dc28729f9b996f9806445fe076905e7f SHA-256: 9bc52cab04656dd1b6c4a137b9730d6d929272353c7f41d12ad844fbebba0c8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=unturned+pine+door PDF link annotation
    • https://tskrea.com/userfiles/file/51339875811.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f539e784ca---kufedem.pdfIn PDF document text
    • https://777mto.com/contents/files/guzekavatamenag.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/18774353999.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/74584901300.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/93759213552.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393366a5df1---78811965739.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614025dcdc7ad---rapadolukiza.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614040ed3962c---68907538269.pdfIn PDF document text
    • http://szpk.hu/_user/file/bexagope.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/70584575362.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/gogokenipogo.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/53311677387.pdfIn PDF document text
    • http://abnicum.com/files/file/savubemogukiditupa.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/zaxusapuvumugiwosuloj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca4b1975c---pugivor.pdfIn PDF document text
    • http://agavietnam.com/img/files/vemonejenosotutexar.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47a1b36f3---lewamitomeridogi.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/59981600230.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c9f76854c---63374677536.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/gifonerulazisujep.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/320714f70c6887d1fbdecaed335268b3/sunewo.pdfIn PDF document text
    • https://vleek.com/uploads/files/28358627703.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/nujonizogige.pdfIn PDF document text
    • http://15881588.com/ckupload/files/mifoteruzazotatowafunujo.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/garekulimedapexuvejeri.pdfIn PDF document text
    • 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_off0000ea52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA52 18156 bytes
SHA-256: b4ede0b9934191e30937ae18bdc566a5abed88489e762e8847512e4e4b9a564a
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 10116 bytes
SHA-256: 505dadad278053d3e9efa1739311f1d2ea5c9f55460424cf27efd0b4d9e12d2a

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