Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98f003b787db1c3…

MALICIOUS

PDF

78.5 KB Created: 2021-09-02 19:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ca82917a5b7a017957544d1fd6b9608 SHA-1: 5d202b2c938ecf57ccf1e9fb755b81aa69ee596d SHA-256: b98f003b787db1c3e7129e4bc62ef797a1fe2ffc38078696321050db6750562f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mebelihome.ru/upload_picture/dogazobunusekegob.pdf In PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xujaf.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/75884332076.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/98e0149cc79df7e994c12b277f5769b9/pufipezitolidofat.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/24811663584.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/futuwomupovigize.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4f79e00d---totifodi.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/63204584099.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pd407mkcqbb1621f5qpkm6ui83/27518074389.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/553412515.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874d7521b39---58182077275.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b01e7c137---9032688799.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/077892022cc5a6dd32b5fed439085fd1/kinebewuvofibajana.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/fidasirufujusetirobad.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/sibukaxitofe.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/45069246770.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/nujepipononit.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/finusikezinadelusora.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kovogatetazelanun.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23bfca9f93---judepomevemiwina.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/487abed82bca37904ebedcdad5645137/2264044579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=personnel+psychology+book+pdfPDF 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_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 17428 bytes
SHA-256: c0731bc476b0a1cb0741d238321f535c0b2c689ef33cd1ea654f15b6285541ea
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 10896 bytes
SHA-256: 725c870c518f3ece89a1981d4716343414b005ca17e24006daf58cbbd56dec53

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