Malicious PDF — malware analysis report

Static analysis result for SHA-256 9693781744c7725c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 40e072e6f387d3b0824ac064e368f350 SHA-1: fb285c7bf514ec8efc53edf1c2b9fa8e05a9a1df SHA-256: 9693781744c7725c6206b1fe6595f0e079b41f886c89d452b0626e0746876db1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, which are likely used to redirect victims to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac84d75765---vifubi.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/pozakotafevugojaz.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/79311220435.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/bijaval.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070e6da2e8b6---xavutimuwaluxez.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/jedakonixakobigovokazo.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/pedofijimibo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/84208584625.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160855dcfb926e---86508018680.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e11d63fc6---52020047918.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/zabubijurajivegozafa.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/26706796179.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/feposazesowutizebipenipiz.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033d3dd61ff---18023296750.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/36193105102.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b6cceace240577959d85d4a65f1ef70/xesugi.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/47062491922.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wiselemakeza.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/rowapitupiwapa.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace99852237---bifoz.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/dewezat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=psychology+of+education+lecture+notes+pdfPDF 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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 17484 bytes
SHA-256: 05135422e3584b1e30b5ab1a2706c26418cc9b75e60445c335a3e0e7b3810f92
font_02_sfnt_off000106d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D1 11116 bytes
SHA-256: 342e5c02d6168bafe7d6685695f9bd0ab8a9f3220b154f19c13b12cb4217ad0a

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