Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ca37527494c81b…

MALICIOUS

PDF

74.2 KB Created: 2021-06-26 04:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e16d462fe53cfcc61a3fdb2a419cce52 SHA-1: c9d97865e6e7e1c4e5b8e5912a295807593819ff SHA-256: 05ca37527494c81b56e44a00732b0218120fee4f3f0c5c2fdd7fa2bcdfea8f6f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=physicalism+philosophy+definition PDF link annotation
    • https://louvre.lv/res/wysiwyg/file/vebazopegirefala.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mebukujapate.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/24c0ff0240c25bb146cb3e693b6472a1/gupopagel.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/tgm2h086uqecpnp5stihtjuskh/dokalexonimeteduriruped.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae60696f349---pamipenel.pdfIn PDF document text
    • http://bptramptour.pl/files/file/52663193903.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/donijozoris.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/98764115589.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab76b5f0664---jilukeguv.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/cf56fa9496751dc4f0623f012483ecde/98357724459.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a04911543---razabirixeniwepajo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/fc32fcb9b5354604da489b5a37e17fce/13233451574.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078465748b64---81498471249.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5aa1e4f97---ketafi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/cd3d1c1a264d5254e09676ee65c6405d/21784261133.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda8b41e7a---figuwidujujedop.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/98c2581e849d1221c61513acd41af721/71855009519.pdfIn PDF document text
    • http://com123.vn/uploads/file/fozeb.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/zixenivasotazidorot.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a89eb449a---solazafure.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5bc35750b---79360656494.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1544aa32e---96853228850.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/derigidoxedod.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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 16096 bytes
SHA-256: 295adb0ef3f65c803ff4b80b9f67cab78b20266c5356775bb808c45343edc8da
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10900 bytes
SHA-256: e02fa4520ae3427afd460a2a403933737ff70f9462df31d6a03a120934874596
font_02_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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