Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a46172c575f6fdc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 19:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a31f6d3531d238f9987225570af45ba8 SHA-1: 3376fcf3b38baf505764bc43f8861acb00847c38 SHA-256: 9a46172c575f6fdc2b4b51f361a92e66745307f7e109fc3a1e9035e252fd94a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=chevy+ss+manual+for+sale PDF link annotation
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55805ae8a6---66179454522.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/75151807865.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/5c4cbc86d536464fd6a8025d08d46d25/lisumikimo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/16905448137.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a5be00a8---kiwizupejerikorose.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/10679073175.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nuxemojerilakukurozil.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c4gs2hku60rptaj6r08nd9bsg1/vozaxejabanivesa.pdfIn PDF document text
    • http://qdjshg.com/files/file/lekazusaxibe.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/o2dnbst9m45b9nberv4msh8cp5/jakiboxexutatimop.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/jiwobuwagukutuni.pdfIn PDF document text
    • http://xinyuemu.net/assets/202106/files/20210613140630611153.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/duboral.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/kuzazigus.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/61064748565.pdfIn PDF document text
    • http://www.asslar.de/downloads/16048120201.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eadad591---39554155749.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/8788895440.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/xazajaruzusujuzad.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080e6e3c2fcb---8763917675.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/2f910a7935c68c9a365e3f3f5b197d60/59751137213.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f890b63d---godotosufep.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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 17888 bytes
SHA-256: 0ebd42da42d129546bb68459b82bae48812ff5e63f5d2faae3b3da3e495846d6
font_01_sfnt_off000104dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 10600 bytes
SHA-256: 9ea7b929a07e23ddca89267cf7f6dd7fd7caf786c3d1e480885bcb60ad359089

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