Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada57abd420fbda7…

MALICIOUS

PDF

188.9 KB Created: 2021-08-12 16:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23311b264428d99a8a9a57feb8047dbd SHA-1: 1ec143be5183b8ec4c3affece5af6e03439b0c5c SHA-256: ada57abd420fbda773f75307594c32864cc5e2405fa9467ef389b9b1c3f1a5af
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the compromised CMS upload link farm heuristic suggest the primary goal is to redirect the user to external resources, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cb2364a26---64887619490.pdf In PDF document text
    • http://paradisoseminatrici.it/userfiles/files/vumuramate.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082f62e58c6e---febavabokejasodonowu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608109011e0e1---sutudapoxilagexoduvofaxak.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/38099517338.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/52800432228.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/xevozimusunoduvenod.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58b0a43e6---wobupidemizekexoguwofakap.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/keponal.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b21576273d8---rotat.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6771279a0d---39961219581.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18ab70b628---5355292461.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f0cb7e1033201c91eade09d7308c43d8/26139532611.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b92688079f87b7e55b6994360895e463/xadasirozakowemetosom.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa90f7a787---jowosejirejiwija.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3b0a1d3fac17745fcf1f061c5ac7c9f1/58294437739.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fefubuvuvedilose.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210812054405235.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/43188228987.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c70e92cd---54347269281.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/wojogikegi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/ludozufuretuvubi.pdfIn PDF document text
    • https://digireg.si/upload/mapowotumonezebusix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=40+hadees+in+arabic+with+urdu+translation+pdf+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00027629.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x27629 35116 bytes
SHA-256: a15d2292f5675602fa1ede223ed158fff7b262cf015db55fd0b68bb2253477c5
font_00_sfnt_off0002463b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2463B 19760 bytes
SHA-256: 15b21529f36ce0022322b8afad6d9568f5f3531a56c70aa7cae4294b9e2eab89
font_02_sfnt_off0002b292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002caa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CAA9 11144 bytes
SHA-256: 808d6e3d3a2ef80983431dac60067604c34b69efbe0b5d28cd38e5929ee5ac50

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