Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbdd4853a0fe884…

MALICIOUS

PDF

90.5 KB Created: 2021-08-01 15:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9bdc71bcab54fe39020933efe66d02e SHA-1: 3e5eb439287ba9b78a5901a6fc7b72414142cb7f SHA-256: 5dbdd4853a0fe884143818ba4c721be6a0da61158957e7e8a8d326e9dcfef32a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting it's used for phishing or distributing further malware. The presence of numerous external URIs and a link farm structure strongly supports its use as a malicious redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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=what+is+blister+packaging+used+for PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609660cf97465---wigadisedodipevawuderij.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/sufuzamefuluwuv.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xumobekozebatusajojerevas.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c7b8eef5---32554236533.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41687727353.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052109162832.pdfIn PDF document text
    • https://hsse.cl/files/dutulakiduxijurizozif.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/dipoburijaresemi.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/xadakuxinatuw.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a28cefe380b3b62f1833a5d982a7cc66/nanuraz.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff95ab854a---13161674460.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef447d39---jokidebe.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/84765236507.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/dorekasevowazopezevufuf.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb24d747b6e---jonosaf.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/909c2bf4fb0abac84cb9a15765adf323/bonalusopisirugibapumon.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/38234913098.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/94021624079.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/sizilenuzi.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/73088414822.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/78794528974.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/pto4c4tfkpbs76l70nun2rtamm/73216196167.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72976d6669---gotexoboropaka.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/69298443045.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bf9c43c42---kifiwuv.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/46018706119.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_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 11224 bytes
SHA-256: 0b2006fc64323ab120a9ac86d2c64718f9204ddb910a4ca86c5704573c517b15
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 16756 bytes
SHA-256: 2ab66471ab8f11cc4070794f6ea0983f790833b2cedc2786208f2655726dea12
font_02_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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