Malicious PDF — malware analysis report

Static analysis result for SHA-256 934da9d15f56e57a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 22:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20dba091f10c67d895c947b7b31906f1 SHA-1: d96e98346f0f708962ba64c2803a6ef773280b38 SHA-256: 934da9d15f56e57acf66b35dcc3ab37aa350811b9790d7ef6312f0ecfdeb7ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b6322fb33070685ba7a9551801cfd36b/81267917648.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/pg9qs8s2nedviun6q25lsb2dld/dexugivatenofenunexeki.pdf
    • https://majorsagilekvaros.hu/uploads/file/kokofu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609457f9823cf---92284752655.pdf
    • https://akapacha.com/userfiles/file/luwifumaxi.pdf
    • https://soudurelauziere.com/upload/editor/file/71172481578.pdf
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4de3e72ca---8981345401.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c691b042---fotetozefo.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqe32li96fmi201kf1ftrpd721/wixexipisaretegedena.pdf
    • http://al-bandak.com/userfiles/file/57306259565.pdf
    • https://xanbiente.de/userfiles/file/zamoxemexunorureluf.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2fc1a6d67bd54d67793c9ad3b5a227eb/nesevagezesubi.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/913ab33158b86c0e6347be9c66324e45/67834849930.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/771225a186c2cbcb3900a8408e10f514/5332351038.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16088961cceb10---penuritizugilefadiv.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea18fd4656---45658221208.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jmeo630v4cnol73ce37jeoq158/7853559776.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a482d1e7---50322296702.pdf
    • http://romengo.com/ckfinder/userfiles/files/8097341681.pdf
    • http://blbr365.com/userfiles/file/1621333893.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/859001645.pdf
    • http://austria-ex.com/images/blog//file/68886947064.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3ac765f44caf61315c76026add654ecf/30695199276.pdf
    • https://pbchistoryonline.org/uploads/file/nikineleris.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=call+me+by+your+name+free+movie
    • http://s292376414.onlinehome.fr/datas/imgmail/file/detaxinofired.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 16792 bytes
font_01_sfnt_off00010a38.bin
10b3ef71a0f80bd8b85280b222f3b223de343e599a096ccad8cd1c8c7878d12e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10560 bytes
font_02_sfnt_off00012243.bin
30a3672ab0b8f2bc0c25e91d706eee796d5dd899d41e2d2a96be2e45e916bdac
pdf-font-stream PDF embedded font (sfnt) at offset 0x12243 17116 bytes