Malicious PDF — malware analysis report

Static analysis result for SHA-256 da741f582fc7c3ea…

MALICIOUS

PDF

179.7 KB Created: 2021-07-07 01:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50514cfd887d5621e782ba69f3a2763d SHA-1: 2c1930963fccf342986cf2ca8676b7813fd084a9 SHA-256: da741f582fc7c3ea6b0bf29410b3ccbb35a94f67f38a57f85fa09da0dc226fac
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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://bibliotheque-des-arts.com/ckfinder/userfiles/files/razetofikazuziragatilemev.pdf In PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/48038644970.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/gotulebefapawisale.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a52877269---duxem.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/29494236141.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8e2e149c03b2eb3a4e0d191681c0f349/14303291064.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a33b78b5f84---fasedufapi.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/8b280a409681ba84dc73527ffba1282c/16521620328.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ac8697bd982a5461eddcf6b633de61f1/38513705597.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7af9c67b---56076078739.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2aabe218e4f63a8708159a6993bff803/50654325273.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/13641153787.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f549efc5198a7da92a676d4de3fea48d/48153423669.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608146bbbc6c7---11887677733.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f840ae6ace3be594b7533003dede793b/misugobewozetumunalozo.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a2db5da6077e6e8bfe5750656385566b/pogonevoxonevod.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed63a242e4---vinedakiponipu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7f64c04e408ed141dc6bf30d167475bb/34137180850.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/852b35cc6040880c110debaee4c486d7/23231092264.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/if4pee9jcmigifbm6aetda0uk2/9251330947.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4006b39a42ec7757be161e6bb8cc20e1/wedaw.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/chgnqdos2rji51sh7iqjhaidkn/94073209718.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b1761edabecf480187c422c04d3d6f00/80855628249.pdfIn PDF document text
    • https://schmitz.cz/res/file/vimoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=morphine+is+a+narcoticPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002626f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2626F 10420 bytes
SHA-256: dc861e6e0f45da585db0c0afe56b58cdfdebc1dc3a3c4188a09cb54f6c7a7016
font_02_sfnt_off00027a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A03 21604 bytes
SHA-256: 80ef11766170456d806986202c125f6b42ec2491a42228fd7d84f1faf4259aab
font_03_sfnt_off0002b24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B24C 3732 bytes
SHA-256: 7003aa7cc630c36e60095137bec10bd336bbaf4fa63de0d45898ba0b2084d01a

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