Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3657a0605cc2cb9…

MALICIOUS

PDF

81.8 KB Created: 2021-07-04 02:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b73c826bfeea88d70ffd8c72e0f56a1d SHA-1: 71f03b5efbbad763c4cd7509274363718056db8f SHA-256: c3657a0605cc2cb989c756dfd0759b216d1c3aa91e8adbd624177b986e239cda
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection attack, aiming to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/miresozakironogoxunili.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb88568dc5---71848741343.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/dufonelinilomukifetubenik.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404cf13062---dazanelamotasegazusaso.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n30m1klsk90qsgvojsggcangbv/romiwurinep.pdfIn PDF document text
    • http://wami.cc/data/files/5417895581.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/77590617763.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ar242fdv8tcgp20t5oaaq5gqh7/nabexenubo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/59f683d555187c3cf305e0fb45a3c52c/tadozafilugodedoxaba.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0148e41bdf---juziwibopinike.pdfIn PDF document text
    • https://anfauglir.com/images/file/zijofamubigi.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/76527773641.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcf8d5917a---15897256347.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/noxajevozolasitamaxu.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/bonuxivux.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/74749789645.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/akvi3jec9ppngangkjc6nir0v5/37102356493.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a9c2cac708127a1c97bc844c314d27a8/67428861875.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160938375e25a5---80379973267.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5cf6de2a290558af85866568ac331477/64696930743.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/rukivajekiku.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f0bab6b26---korutevimemuvemowixegoguw.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zeduxuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=two+types+of+curved+mirrorPDF 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_off0000db7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 17320 bytes
SHA-256: 6ea79750618b1bdd975170a5c3f87de287dcb0918a17667adfd4bb090a781de9
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 10800 bytes
SHA-256: 0955c5f6825d23b2055f37998dc67957d33182fc65c1150f4528c4d7852c3ca2

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