Malicious PDF — malware analysis report

Static analysis result for SHA-256 f757458ab3de07a1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 08:27:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d7456078edd2d306142981dff388de7 SHA-1: 9d0f40973dd10281d1e3c454bd4c0c5190866397 SHA-256: f757458ab3de07a1ac3d907087f0e3a6064bcf7c6004df2868aa45c3d468039b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URIs pointing to potentially compromised WordPress sites and disposable hosting. The primary lure appears to be directing users to external URLs, such as https://queure.ru/uplcv?utm_term=dr+who+the+invasion, which likely leads to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=dr+who+the+invasion PDF link annotation
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/97188130604.pdfIn PDF document text
    • http://potya.com/83369931692.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/pawiwuresex.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/golomuxonasewaloge.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/22123156540.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/99701173806.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/61167361811.pdfIn PDF document text
    • http://venkateshservices.com/uploads/1951386439.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/vafalugewetanemozeta.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/71898956121.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/xesarilewivanezibekifaji.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138768bc9486.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/jibopulogezuxoteperuselo.pdfIn PDF document text
    • https://tckontrola.zagi.hr/files/zexagi.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/jewogadededetowabezibujoj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ef6a358a7---38192840850.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/foxuzokawezebadopizoki.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/34521609453.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210916121757.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/29cbbc0c2dd0863fe8f94f82774408a0/48578800838.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/9068743832.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614959fee6fab---40667002971.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614450602712e---34304641669.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_off0000c260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC260 10312 bytes
SHA-256: f89263059dadacba0af3023517f82342fbc98cc3a3fcb6af6e5776cad4c434e2
font_01_sfnt_off0000d9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A6 17716 bytes
SHA-256: a2e928a67e12fb71f5d39eadd44236cf365a85f6c10ea786fd04b9ee246ab018
font_02_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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