Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ab8270da9f9a73…

MALICIOUS

PDF

91.3 KB Created: 2021-08-22 15:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85ceca793add6e45f1ca386a91b1d03a SHA-1: 372b9b0921c8ddb8c4ad4f0b8a96e523ee1120e4 SHA-256: 39ab8270da9f9a73b3a4cd8fa9767bc0bdc1b11f7bc6d134c5bab998b82eab51
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, some of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/1d67f3a9ff78251b7f170a88aaca1161/16672383717.pdf In PDF document text
    • http://indianspringhomes.net/userfiles/files/zuxer.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b7a31527d765e67d546560ec1150c7c6/92779071986.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609474e06fedf---lotavumifixuzus.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/18846521767.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e182d461bbc---pevavigozolimunelawew.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cj3992m8jk842dl8pccgrel05r/51087576311.pdfIn PDF document text
    • http://sentralperdana.com/file/20999639929.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/gujazumak.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/5996731255.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/07ae4ff62d63d83f5426e5d968d35566/23420147413.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/9748733381.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210704201109.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/gutakulapumopetofuxan.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160738e029345d---gipejorefunuz.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d891ce6824---60666518276.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/70584262974.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/32733254053.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kamamobujoxisupi.pdfIn PDF document text
    • https://ksboutlet.com/file/files/76563475498.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/mefowogujesed.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/rarijerupom.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092432a49a4e---gogisama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=salcioara+vascan+falimentiPDF 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_off0001012b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 17136 bytes
SHA-256: 3aedb400901c16aac7ee162f3962f34bfbf7c9f8487ece1821511ff0f7ea7992
font_01_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 10640 bytes
SHA-256: f4f9cdc94b8417f92350d52a935cb8181335fa643e55d3156f900fef85e3f67e
font_02_sfnt_off0001450a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1450A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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