Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d4cdf303163d19f…

MALICIOUS

PDF

71.5 KB Created: 2021-09-08 04:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1fd6b6dcd85da7de2f708ab91e42ba4 SHA-1: 88f8cba36cbcc51a41ec4d1c02b9ad693074ee31 SHA-256: 8d4cdf303163d19f01325c46f003019fa32d0d07760c204c62b110f4ac16cd39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=projectile+motion+no+angle+worksheet PDF link annotation
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/469de7bd6040cea2bd536596693889ab/jowajesepalu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd84f99f5aa---14471186571.pdfIn PDF document text
    • http://chinalabware.ru/d/files/31698565027.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/nuvamejotifala.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e0b7b75aaf2790a629ce5162c44e1760/vanomakewubupupegoluret.pdfIn PDF document text
    • http://tencanpowder.com/d/files/zadogepowevozujakifirad.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04b05b623e---19439893161.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/zinivoxezedaxajeb.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c49c9840bed3d2ec1089da6afdcb0d07/zoxenug.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/jemukozewezapeki.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gikamunesewesi.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/88845880365.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/majifekilutipel.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f501446e2d---benidesowixatamotegusax.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/nunatonal.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/satatutofopebaxi.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/nijugizijirekose.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/gadufoxokide.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/67796244960.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607259f948c0c.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985d015cc13---19570991589.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/34613127575.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/nowerifedutatexupuwupi.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_off0000b58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 16352 bytes
SHA-256: b51e6b5ffd11b5d6703585c71af21b837abefa70934b5a278b3d45bad93d54bf
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 10984 bytes
SHA-256: de6b0f62585834f352b95305b30cd7866d2d7fb106a1e7a304a76f0b56d85752
font_02_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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