Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fc34242cc7b622…

MALICIOUS

PDF

141.5 KB Created: 2021-08-06 23:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 684993f80c63ae141935b27bdd9b6e3f SHA-1: 7e658dbf1b67dafa2c8ce1405965eef218fb310b SHA-256: 27fc34242cc7b62220e52b3dd693c3d78a107a19d8b476bc78d25daed155b6c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=conformity+and+conflict+15th+edition+audiobook PDF link annotation
    • http://zezoalza.com/ckupload/files/finadezur.pdfIn PDF document text
    • http://htwy.com/upload/file/3302322101.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/vk0t762dnp23gkf43r3bfuurfn/zigunis.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/0m747e44tac9sugpm4ss81mvei/nagatinirufatulagilowimi.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/b43aad7450c0074ceb614458faa235c4/badujesugeg.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/40984860662.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/56610030631.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/84662023146.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccb498fd47---nidoxoxulisekulevimesas.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/40b0a4a15a7047faed92c02eb896a969/sijuzavodonirasazomivirol.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e43ba86d40---venipuzuk.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/76091343095.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/23041471773.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7857cc87c6---44332022979.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/gc9frnd642vq8jvf7ao17eo9p2/75955987233.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab750e800---75202092398.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/mogus.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/41cbeb72ce5f0aa65f473b1b48609f69/9203229453.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bb0183ec4---42139947303.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dffb5a06085ad84808ab57dcb0d88d63/33134312083.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/40807705390.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/gagigobilizifo.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/nlbgtflkual7i0smidd58umr5e/mobafasedafijak.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/81092671208.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/mukodeb.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_off0001b86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B86F 11236 bytes
SHA-256: 00ef87e6d00b0f2bc6474def5f708e5ae7c4ff7156696ec1cf1b9c98164c025d
font_01_sfnt_off0001d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2B8 24556 bytes
SHA-256: bcba07487b209dd7a1915c1b96b0f9fb2b3e865a2a07dc74c55a0a69f32517ee
font_02_sfnt_off00020f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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