Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a311b72245ef4e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-20 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10e5a462f703ed93b59dc7bd96094a68 SHA-1: 62feaf4c11122051a5dd6c749bd3d1f66ca90dfd SHA-256: 69a311b72245ef4ee77ae44cbad66e987dff67d0feac38ccae289ed024492e59
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=google+play+store+wordpress+theme PDF link annotation
    • https://thefertilizerequipment.com/d/files/343530247.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/73069174360.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/filimodiwodosenosit.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/52123824361.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/davajufevawiladorem.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/kebakuvelop.pdfIn PDF document text
    • https://tarsiman.ee/files/file/xisizigulogofowosif.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/kolaxujagoxoxip.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/57682877466.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/85904039664.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/tizujupenabuvupup.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dr4jolh8762et6a8jme36k6itv/49022685921.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/64099525158.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/79079049502.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613caeedd6e01---40316256589.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/59b7891d2efba8bacc62a16cd5920f5b/88888645816.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f4600cf2---99149145397.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tizeragudomutusu.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/welajan.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/rasapena.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/rukorewenopirivedobigim.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/tixoxejitifuzo.pdfIn PDF document text
    • https://korankertas.com/contents/files/divexinojo.pdfIn PDF document text
    • https://people11people.com/uploads/File/godaturemamixubivevi.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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 17180 bytes
SHA-256: b7e36ad633a91697a1fc445e8b16d54182cc68b611292ae8e310365349367f83
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 10880 bytes
SHA-256: 05fd05e93309085e6b27d00b138c7cd71d2d9fa1fed17ae96373e9baaa22bec4

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