Malicious PDF — malware analysis report

Static analysis result for SHA-256 130938c5b656a51e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 14:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 255d830b8265578f420d58cb526ede21 SHA-1: 82cd88ea430953f60a0d64141a5a05d671f689b7 SHA-256: 130938c5b656a51e13be5d81c60f0ba22e3127e16a60a1a0d694f05449b97815
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded JavaScript stream further indicates potential for malicious activity, likely to facilitate the redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=spider+man+smartphone+wallpaper PDF link annotation
    • https://sentinels.ro/userfiles/file/busorakivurinexobin.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/tajotowizidud.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/99347c12d8ede112db50923700003687/zajukixugamivuman.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/85847876340.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/gowoku.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/6303266369.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134addf37613---60364192571.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/pajokezaluzivadaxe.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/vukowodedumuwegedamoma.pdfIn PDF document text
    • https://energooptima.hu/upload/File/sijevawuz.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/235d9b7ab470180bff7ddd2c47f5c7da/xafexaritepabavaviduku.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/jemupevujibosupevuzajejor.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtj4kfuv53utve9fd7h3i6u423/fidogekisasitunovow.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/rabarevigusapemekijoxure.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zigiraj.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/9534860330.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/58736227442.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/53726979056.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/lexebozosinuvasamuxaw.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/68687889959.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/80048041743.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/japevomasikak.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/viwefugekebekalol.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zuvodivagafas.pdfIn PDF document text
    • https://amgaa.org/temp/files/ranatudukimef.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/163f881f43c89b14a1cd12c54c21da75/namizilikinatusolaxirakaw.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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD057 16848 bytes
SHA-256: 66770e89e749acdd49309b70c9b5ce33ab2f87b3fc011412ee496d835b743046
font_02_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 10816 bytes
SHA-256: 31a60d0c09574769850c0a28ccce8c08e231ef396dbde9dc1d6b8ae32f50fc27

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