Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e87c31e5bd918c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-03 21:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: af4d03193f5f86f1c7abbdaaebd677cb SHA-1: 73f2f1a23d4b5d88ced64852d95b5dc4ea6dcf58 SHA-256: 33e87c31e5bd918c6a84e9631ed121cb6e55273619f438b709c93e326638aa92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites using the Formcraft plugin. This suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b067a7ef357---83598463377.pdf In PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/42146863950.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210531081453677.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bojeluga.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef37c1526---99512045530.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8dd0514e---84624194936.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ed2ca1e32---77356090981.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ef64a17---kevesobunoz.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd44180a24a---luserusijotowevozemux.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/76d9b25d6e512cec1a9fb4c61fbb59f8/51421910112.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/vawenelatomol.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/47335f50515a171a84c7c966a3efb788/kenogulonunoxel.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71dd868009---mogotim.pdfIn PDF document text
    • http://kfbi.ru/content/file/gawevasonol.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/39849076202.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/nolaxivemodavumudejitasu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f05d11eb7b490c0b28ecb65a30cc8dc4/50844760307.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a071e994f88---furupawevoje.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c89069964---kunaxonativakatasojupuz.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2059a18c9d7a925fa41817d225b1c77b/goxonapesexekudo.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/pizokosovewutavoluji.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08a53a589---tofesemunujususizuvaseb.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/45844871041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=college+scholarship+thank+you+letter+samplePDF 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_off0000e95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95A 17432 bytes
SHA-256: 6ffd8d19708c6147174a3f06cc7993f93fa86312badc58dacc8e8bbe80063f65
font_01_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 11160 bytes
SHA-256: 27699c890ff287d5d330c3f41f2c9a223717b35c1ede39ccbd2518b1054be581
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.