Malicious PDF — malware analysis report

Static analysis result for SHA-256 018230a579bf8a52…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 16:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd6929f1b01cda72e89ca8d75cf07059 SHA-1: 1cc736520ff9994fa4f05315f19e2beb2e937f9b SHA-256: 018230a579bf8a522cc935ea61e0c668b1484fafc9380e9c10b37d0304afb132
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm that redirects to multiple URLs, some of which are hosted on compromised CMS upload directories. The presence of external URIs and the link farm structure suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://clairerolo.com/userfiles/file/39640807250.pdf In PDF document text
    • http://lakes77.com/clients/47041/File/bezufujikibojawen.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/sositapajifixuzidabopele.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/nukeluvagutugogebonasal.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/7011066073.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/pibif.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/93987485019.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff76575525---gorarebasaligejezuja.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/j5u40nmbvg4i28ruoi4jqe6ns3/46802939719.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/22046578381.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f63b42bc17d---52747580810.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/83670644144.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16095d754767da---zakerijisufukatisifaluju.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/kofumizerewopulakejuwu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7fe115f9430127c2a063c4016f4d1bb8/gezikiwajufekuxalavavos.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/xopetavogosimugusuru.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad502092e9---66345954653.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4c3a177497e3eb87669f1eee488cd291/patekiratafetixezud.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/sopigixemutajugifuz.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/56792639619.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc9c4ab514---dabagufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=biw+design+considerations+pdfPDF link annotation
    • 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_off0000b6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 16232 bytes
SHA-256: 5ca69eb0a49e4b810ee4157e2c303c900745d73bfa9e4330e3cad3c5da2c1522
font_02_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10888 bytes
SHA-256: e8e8bcc494f60c02b169c523a963c1a26ac1b0e76fa8d25cd53e47466331956b

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