Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa3cf6a05dc9861…

MALICIOUS

PDF

89.8 KB Created: 2021-07-24 11:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a412bc161fa9a40f9834f4e23ef8b5da SHA-1: 202b598cfbbcc0913a6fdde111a0ee8c68608c09 SHA-256: eaa3cf6a05dc98615111e7aa0da3a0ce45da613079f8f1a44b6c6590ad58ea6a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm that directs users to multiple websites, many of which are hosted on compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or deliver further malware. No scripts were extracted, but the structure and URL targets are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbef66727e---56558079773.pdf In PDF document text
    • http://eiak.org/upload/editor/files/fegarejuwuxagaba.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97cf593a7508db690579ae9aa9c18b6e/fomugetojem.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/nisafakojubupawowuvi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9721939e2---mozew.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ff45af869---suzuzinirimebe.pdfIn PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/kurubeboximevutawukujanon.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/nofagafufesiroxale.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/daa73f2b2fbe7625e4f4f232053a73d3/jabejagajexazerinigomisax.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/36774849985.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/denojugosilemusukir.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f1ed23db---vorusojatu.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/39410862577.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077beccbf25c---23692246358.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/un96dd7oug05chsthdakvbamj6/noluwunudanemuxa.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/fasuwotin.pdfIn PDF document text
    • http://asfalon.com/__files/file/54822326210.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3232934fe3f378630cecbe095e848b29/penanuxetilakewixukiwesar.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072313544134.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/tipisipopekemalenak.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/gozofigutageposuginujapig.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7f8fbfd22369860bace184991dfd230f/gurox.pdfIn PDF document text
    • http://geose.ru/userfiles/file/91337990084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=simple+past+present+and+future+tense+verbsPDF 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_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 10920 bytes
SHA-256: 5b185f386cb8dc712ef049ce220fa1591261d8ba4ae2d0e601e048a879867b3e
font_01_sfnt_off000112f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 17056 bytes
SHA-256: 0e39464854c49bc95f66fa77effc1546a37c70249ccc661b2bc416de0225c673
font_02_sfnt_off00013fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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