Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42ddbdd4e506cd0…

MALICIOUS

PDF

83.1 KB Created: 2021-10-09 04:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1a8536b40741ee51ca7167e204eefe04 SHA-1: e6cc189d5acb301c511e2f81034ab09c7b92d520 SHA-256: d42ddbdd4e506cd018f9f951f24d1c27da785616b60de7bdaf48717ca37378b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external URIs, including a link farm pointing to compromised CMS uploads and disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads. The `utm_term` parameter in some URLs indicates a potential phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://nomylo.ru/uplcv?utm_term=survival+roleplay+minecraft+server PDF link annotation
    • https://tutorsbureau.net/userfiles/file/jesiwusipoladuxubobobu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16160b7d994992---bomakegebovamilawefa.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/10192222572.pdfIn PDF document text
    • http://zamgph.com/FCKeditor/editor/filemanager/connectors/php/uploads/file/181800071444.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeaf88d1b8---42448913459.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/30129131641.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/fiwebanu.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/96644048896.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/dee1d8ca974c219bd9f4ca5f0ca7b84f/54916384932.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615008c17e51c---99656939690.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/652f59af4ae9e22af96b546e4f24f2e9/batebeb.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/27903824588.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/sazolexineto.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/54604463245.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109251559501186.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1a9bf4aead96fe4ecae96c7c3bba42ad/15161490032.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/janutezumuro.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/46900955292.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/bepamajaniwovamasaxa.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/pebexubelorazufujukow.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e47cbcd448---digewubum.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b542577839---jomemifukas.pdfIn PDF document text
    • https://dhesient.com/media/66091271339.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/75134277331.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/62866005894.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/powuvivosuvufibiberopoxoz.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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 10996 bytes
SHA-256: ba5b56a3342a3f11c443484749a917f8c5b28e6a8d15c09932c4f7a99afdabcf
font_02_sfnt_off00010dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 18640 bytes
SHA-256: 88108c924b4e9e10bcdc856c723d5e5d5b7eb39b9a96bc88bc7ca3bd78a61bac

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