Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fd5570f4e196fc…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 11:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce2177f0bd3563ce782e0d80b7dee726 SHA-1: 7ca633d18abccdba5625398c6a531c9de22eb961 SHA-256: 71fd5570f4e196fc15da9d79d224c6a0d71843eb1c5bd9199c255a967f1fa839
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript, though not fully analyzed, likely contributes to the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=akon+right+now+mp3+song PDF link annotation
    • http://hydrem.ru/images/file/87301427905.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b898be2003d---24732009043.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kapezirigibosanawimewaju.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5d5b6dd7f2bcad48bc74f5c6c7e3746b/11071443991.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/jetozakilove.pdfIn PDF document text
    • http://calisnt.com/uploads/files/29030180562.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b032eccbe28---pafegizarajigodusug.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/83643896223.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160814fb89f353---tasemekevonifamezirezup.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be63d7d119af3e06a6ba8629d2a70046/65557774024.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/josaseviz.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/71792494077.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lumijodababudeni.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bad7cbb4160---jafevub.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210812015342.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/80575842226.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/26367950614.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/t72itqsoirfhg8v3vir45gifp4/sulexoxuzisivobam.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/14406902518.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/6358920927.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/lawasetuzimijetavenugi.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/48605658096.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce915f2857---dosil.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/a3k7pelgos3b1j1iqi54kghdr5/rosulo.pdfIn PDF document text
    • 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 10692 bytes
SHA-256: 47233056350e2408c65fcd61b970b17ee95024e8efa57079505ef16183bb4417
font_01_sfnt_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 15764 bytes
SHA-256: 9d82425da110cce7be70de533b1f7d26706118182d2b2e4d322f04fa9b0a1364

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