Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4fd85f0d047f72…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 10:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32b5284cd5f9de36fe6d202dacb33f9e SHA-1: 6634ce9d1708cc508f70555e3c2f28fb2f0edd4a SHA-256: dc4fd85f0d047f725148375b1ee47a8c6b21574228ad86924825b460a9438e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=fodmap+diet+pdf+canada PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4d544972893ad4c47c02c80865223fa9/pitudi.pdfIn PDF document text
    • http://modero.vn/upload/files/14699304228.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16106a8958b382---senanatiwadusukupudawelo.pdfIn PDF document text
    • http://allasclub.com/campannas/file/91288690999.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/molop.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fe2e375a---puritoredu.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9265e6372a2eaa46e07e3fc9effbf627/43222632688.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/19000357858.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rjbl6a6fhl9kbcpdqske9ghs76/45569311098.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202107311634377971.pdfIn PDF document text
    • http://jar-ted.pl/file/86228759118.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607260e906b46---jipuvexafiguvigunuvivena.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/18476883947.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608688445c94d---43258159204.pdfIn PDF document text
    • http://beateromer.com/bilder/file/14575428699.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/renukexo.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/bixoxazejivugedixatajalo.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135e38f422a0---2453367118.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/80320608575.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/daporawetupila.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/17832582439.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/titebe.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fanovojobev.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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 10444 bytes
SHA-256: 714a41a90c55716a8ddb26983335d7d5405bc368df993e1b0a5e40cfb0d3211f
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 17600 bytes
SHA-256: 58a7dad31fd824aac957087c779ae565e3591ff46a1fc91f38b7a1c1298d120d
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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