Malicious PDF — malware analysis report

Static analysis result for SHA-256 a524cce0c418476d…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 17:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 582c20eeae5c2bd4dc24661e05f276fa SHA-1: 10a79ba20923ba26f6d1a7e0337de69190a8bc72 SHA-256: a524cce0c418476d2130e6e5cabcb026a95a4af0cb8dcc76da620be21edf9eb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://szerecsen.hu/editor_up/65625050352.pdf
    • https://cityface.cz/res/file/vorupokadagebaluvi.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866bae98f9f---nulasori.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9umvieto2glhom9hejlbtka20b/11939209071.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c3cb4cabe---matufutipuv.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7bf03ae879---wutevolepasixodizat.pdf
    • http://qiangka.com/ckfinder/userfiles/files/89593254278.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/459f5fcb1464b19ccea8dfca2864d187/652378232.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161276ef9ba922---83197215623.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ed21a19b1---58450993950.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/p7avngpqpqjkkjvblkeiec42nl/tosobutamoxizeru.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/p7jnroqtgdfsq4qnpok8eegjtk/10623254553.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ed16ad580d---dalusewupokobeluferoje.pdf
    • https://aldwalia.com/userfiles/files/29507889523.pdf
    • http://maility.pl_adresuserfiles/file/24145172884.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/463236726.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/xujegozobofanovemi.pdf
    • http://maihome.hu/admin1/file/17657662761.pdf
    • http://cnc-soustruzeni.cz/files/file/93628062504.pdf
    • http://kristenpell.com/userfiles/files/82902802650.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/9rcaufhs9t7mel61058t5ru4o7/29203249815.pdf
    • http://techbis.pl/files/file/12745676750.pdf
    • https://alice-immo.com/userfiles/file/litoninaverapevil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=flirt+with+her+over+text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1d8.bin
dcf62be47a617b1a475742d0cd232aae4fb02d9cfa321a0fc5a8361edbc676f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D8 17944 bytes
font_01_sfnt_off00011f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8D 16792 bytes
font_02_sfnt_off000137a4.bin
4230ecf97e2a74e28019b59059a24220e227f88885c6eee8de20200491ddb18b
pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 10000 bytes