Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bbb22d39f76a3f…

MALICIOUS

PDF

87.6 KB Created: 2021-07-07 03:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2de95cdcb47a26edeb4b8fab30134c10 SHA-1: ddab3fbbd8ebf5f8bbbd4a3b1f953a6972990270 SHA-256: b9bbb22d39f76a3f7ea22a746dd171f0efe6ace3954851f0d169e29c29248241
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://synerhu.ru/uplcv?utm_term=industry+meaning+in+business PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/05fc2ec3a31fe3a37db362b6bd42994e/jifijoxifi.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/c98d377464f192ac982a1949a3ba8ce7/35261348073.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/603412ac8bb4f5c24d838c16e4d52fd1/jonemaj.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/lururabuxulug.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1afeea48---senevodesiluvezopulanitu.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/remoru.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/t0tr5fje0cgv7346fi74csq4lq/zafefa.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/zonepagukuwipokuzaz.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608046aaa5371---bofolevujazemam.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/637cd5d46e066940279d1964749a85e1/nevepebigugowigofuzi.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/71504934951.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/qu3qlbtbld09d7upsubpqpklg0/balolapekulowivifu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/9tt343lg8cguhoqdohituc8l8j/lavuwun.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/tovure.pdfIn PDF document text
    • http://tfforming.ru/d/files/80242529007.pdfIn PDF document text
    • http://kleiberit.ru/files/file/50341502137.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/tazepuvejaporelexewi.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2038f856---dizudekepexi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fa15c93f3bed3205b35ced3f544aba99/fepisikixini.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/niderajamunelane.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077aed11baf7---55754451908.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/gulorewadetexavoli.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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16740 bytes
SHA-256: 6ae7b5456c2d7f5b80e864cf47a929bf533c72027317ccecf5555b587f43a001
font_01_sfnt_off000120b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 10732 bytes
SHA-256: 05127a6bbfd72363152435a6acbcded6540f6f9d792a5389de9f8fc5d1bd0686
font_02_sfnt_off00013934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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