Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1c62d3ec432bbc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 03:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3c0befb5377f4ac471aa0871996f7c29 SHA-1: 472f2d3cf771a066a311c727c13a798bc73145e4 SHA-256: ac1c62d3ec432bbc8b79d19a6bf35e108d69b1d572524b9826cdba5c2a4c6cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=d2+dvla+form+pdf PDF link annotation
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb59ce83c---tipufawemevos.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/48604073320.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5a708ccb258e0df2752d4f9422402c8/13156862314.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084000af16f0---rasetidixamazotosip.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/7029674057.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a06a7192ff1---liwosurizadovipexi.pdfIn PDF document text
    • http://winso.tw/userfiles/file/82270823508.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/fh76uktepfklkops0sd9ialsni/xirovina.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/16c9ca237661cbc036c4404be1e951e9/sakixewegaxon.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/metefipivedururarazig.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/bajurukamokej.pdfIn PDF document text
    • http://flexa.cz/docs/file/ginefemezamoj.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/jazawofanixudamiduxusos.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/lawajos.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608db16641946---bijefakidirivivexel.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/53823706c12915e2a152358b2aba8f43/47923525976.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/dcc6d443a353035ec7c09e7b81b82e90/xelalisinuxi.pdfIn PDF document text
    • http://unseretochter.ch/images/file/10677424469.pdfIn PDF document text
    • http://esistore.com/userfiles/file/lowuxolobugofudo.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/83590316437.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/89cde51fdbb72d649ea998f3acffac8c/33397669690.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0a885afd140c3b1b97aa6c3bcc7e0967/88075346845.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/72925865762.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/xarusexusir.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/66203035213.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/juloropibajotonusuf.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_off0000b91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB91C 10252 bytes
SHA-256: 063420dff31b7d4df3c05188edb1f181ad3a709d7530469a9bb3ae3ec008dd05
font_01_sfnt_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 15600 bytes
SHA-256: bf11855896a221fd2931e7b680ca42cbaf3d05dd2b7751308bb4bbb15ccf587c
font_02_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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