Malicious PDF — malware analysis report

Static analysis result for SHA-256 75184beb26e94f3f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-01 02:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 404f1c13e06e7b7c66720ab56cf6f269 SHA-1: bf559b3514fc730a9cce6c76680e10a691665191 SHA-256: 75184beb26e94f3f1de1f6c024c7cbd78c842edf8ac3e1b246de77ae2f9070f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous URLs, many of which are hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://szymonadamczyk.pl/uploads/fck/file/14297961035.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc505c1a6e2---zirunugo.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/43579996719.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/pixupexa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/72be31a587e6f9012b2b098e22090ad0/segizola.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/dudugixu.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ctcpt3gi6vqhra2f66nguss573/37657415319.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acad28c7ad4---xasunotuzufawigowe.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/85500060718.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93884c8e6000adbe044e55f465e3e595/12488101828.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/kewutenizugonefa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a3754f9c---jagejoronajozafonopevija.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/nidawedizujujafob.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/lonodavutanikivogonotonev.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef8845a5a---kolewuwegasos.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a318ba53cf6---pifilosukazutopogib.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af9e48dd3ff---35071901688.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdad0c1cff---97589676925.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003be8c2c9---bagavezapejibulilovut.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bb843ca6c---59951586931.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/37204823946.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbdb6b04a---neroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+uc+for+pubg+mobilePDF 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_off0000b508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB508 10508 bytes
SHA-256: 2824fb3e57b35c4744ed94658854e435d1796866663cafcf0cc832ab2ae53fd3
font_01_sfnt_off0000cca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA4 14536 bytes
SHA-256: 76fdda3a7a8a0e69db8f70f5e98a129ca3b10510efd7127976b9fe95462f0595
font_02_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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