Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bb58ae41936f70…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 07:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 301cc7819500ae19040c32f04342a0e4 SHA-1: 2092b79a3494df952b1e61dfd6689315f471f1d6 SHA-256: 51bb58ae41936f701c6016e6a5c96372a394336a1cbfed2fe6cf09791ef1c4cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=end+of+school+term PDF link annotation
    • http://aarogyamedico.com/userfiles/file/1032928861.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/90936eac6e6a8d4f9a9ef6cc6ef9d018/xofarodavepesag.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/lagafapuwidok.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c213130d18682aa3959e79b83173f3a3/932742237.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98858ec6a---vatejogidus.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e942cb503ff---28659056537.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/92433379475.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160796bff118b5---zuwuwuv.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/zikurutepimin.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ed10e6b0c145963f4c69fdca0663f47f/56372630683.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/77ec1a20c3ee2978281bac24870268f0/68818067731.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/10727418967.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/88042490646.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/tuwuleben.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fb966a90---lilogoriwugebus.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928e457309c---lijadituvaxofuxagoxe.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/rt66rb0jlo3nan2qui41efoari/43140687797.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/tewozuguvetejujami.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/vuxas.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/makobuxawivokasudinu.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wetaganuwekarak.pdfIn PDF document text
    • http://exosushi.com/uploads/files/7545185990.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233e4bf2839---kotixuge.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_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 17616 bytes
SHA-256: 18f789a5bb5e600f1d9d46723f0ceb5a98d1c5cdffbf718d15001e04327c7786
font_01_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 10468 bytes
SHA-256: 59a7a1e6b2f96aa59457345b581a4a6808199bab39c0bf7091108b292887799b

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