Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04816501b7f21d7…

MALICIOUS

PDF

82.9 KB Created: 2021-08-17 14:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 12e30f78dfb321df66f0121da0560ba3 SHA-1: 6957ebfcc5b3888d741cc24e05046c2dbaeda93e SHA-256: a04816501b7f21d7e3b41c08ab65b0a90502f2f03bbcf3dc71f9ef638656c7d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on potentially compromised WordPress sites or disposable domains. This suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0rmtqp4paft0f5i1hgqmuehv33/ganetivolokopato.pdf In PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/rovedakisigi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/linuxag.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/24898888901.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/11k4o8lv9v7qdleic8k6fvl61j/69531301455.pdfIn PDF document text
    • http://atya.eu/files/file/sivugulofomapawivi.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/dejozopiz.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/70274755029.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/93c9499b75f65f40dda4f92f5f1e2a6e/mudujup.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rf8433nu8gbbi0trpb2lni85q1/62231433638.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/oud3aj7tjuu2id36m52j4b8dui/davuwinedorixumemaro.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/61972120241.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210704113217.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/mafevazetaz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/12409904129.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/61415495636.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/kagemupasusadegojamumog.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/zumelobezogefudamipu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/51466990461.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/caee5d9a206edee083250c415a00b863/gepajepeniwizoka.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kosezazuku.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/pazomupurofunepokixo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16f43cf1d---7027099979.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/fakivas.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad4273c133---58622295552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+label+continents+and+oceans+worksheetPDF 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_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 10764 bytes
SHA-256: 89730d613901bdc91b9f2b2e01e7acf841ce66a869e46c871f4bbd589446bdfb
font_01_sfnt_off0000f8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B8 17200 bytes
SHA-256: a579f86b926b189d5d57b63f66bc0bc4f5329133f24c25d80badf109f7e06721
font_02_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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