Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b66b7982f9f0cb8…

MALICIOUS

PDF

92.8 KB Created: 2021-07-23 23:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d095f2f63325a658af5fad0cf1c5c5b SHA-1: b7906dfb19545419f975a764baa08ecc5d1d6d19 SHA-256: 4b66b7982f9f0cb86625a534004cac2fc5ff50cbaf7f04c4d26e491afc35f7e7
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_CLICKFIX' heuristic suggests the document is designed to socially engineer the user into executing a command, likely to download and run a secondary payload. The numerous embedded URLs pointing to compromised or disposable hosting further support this phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/22be8d2e8fc12ba7521de8a30a2e1fb4/saxilepusut.pdf In PDF document text
    • http://myconnect-thailand.com/image/upload/File/bifas.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/58416650321.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/528f62cc9c7cbda6fcd139ff07fb04d3/vutopiwigikuzeni.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/93ce1245258803290ec939a2b48df293/jeseg.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/er8j87tgeo4civnn5951ue7bgs/21679327277.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/vatijajutujubav.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42cef2b96---nedukin.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/u9rj2322e2jilv0nud3dll26ue/3069263004.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/13172996298.pdfIn PDF document text
    • http://abnicum.com/files/file/55876283138.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/nofiredamoponiludupimaze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf00d4b7a02---38044184908.pdfIn PDF document text
    • http://goref.ru/files/file/64103562802.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/73e48db9d548b04a312865973ecc16d7/nogidimesu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/5dfd2855292eb1e312f41fa660a44e0e/ponogika.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3e1b92f307e0c57c424e5a896869c340/44771058533.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944adb5b005---70391190971.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/84209496192.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160987fb830e7b---kipasoromagaza.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/47658278274.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c254f4efe16---12372058025.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kidasalalebagujumijigujup.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/67461916588.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160920339b2f25---repazibil.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b89a2da25a010b7c574eebf2a1911ba2/tadatalutesaxigodujo.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/77048858457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=format+micro+sd+card+to+fat32+windows+7PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 17764 bytes
SHA-256: 35f3191e391782f824551c7fa5af50f7644c55c8ea76d84dd01084a1d8fee623
font_01_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 10864 bytes
SHA-256: 469d149cdd75fad518a1a2e95ece9e4f7b9e215b89ba0c7bfe55c8d6d9d23121

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