Malicious PDF — malware analysis report

Static analysis result for SHA-256 265dd1305c2ed1d4…

MALICIOUS

PDF

83.9 KB Created: 2021-08-30 03:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9892d521336f962f1fff8533b927742a SHA-1: e6dcf987c07294e29f3a36c8d479eb0121123861 SHA-256: 265dd1305c2ed1d4f9c85a8d45b078a56ee63e86de38658a3e2b307865782f6a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other potentially malicious domains. The PDF's structure and the presence of multiple external links suggest it is designed to lure users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s5qoft6vhhacsrdj6iaas5sbd8/13416715538.pdf In PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/xefosolobuginimeruvesebig.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/solamazijadulogozosazivi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b2e256e8---78030179025.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/pamakeziwifo.pdfIn PDF document text
    • http://bakoca.hu/files/file/tofuwavavimogo.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/39c9cb52d6ab3c2ca3a83a09cadc0135/78852959155.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/5d00da918cd458b913aa0952fc0458cb/gupusuropolitekarokok.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4d1b35f8---nisububerasefozezel.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/tqkcqdqs91ts9dnkqvkf978pn0/72098284318.pdfIn PDF document text
    • http://chikatere.com/Upload/files/jozovebutek.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/8255281661.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/h2m5h5r8592vmmi14aq4no0haq/6395661005.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/titemolage.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b450294751---15324245535.pdfIn PDF document text
    • http://garderoba.sk/images/_file/11330593507.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/notapiwupibugibemodotokor.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/18879093337.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/17dkme9d6bodg8e1dlsci6gtlo/40291564168.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb597ca0ebe---karidasebinafofifusixub.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2bfeedd82e06205c912b83627cc00344/wajupidivijunibetijaxipi.pdfIn PDF document text
    • https://bloc-immo.com/images/lotulitozegonebazupolisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=effects+of+praise+and+worshipPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 17524 bytes
SHA-256: 3a13876be9f70c4172e8b54c286cbaa6cdbdb9d990c7aa2102d2b59901e109c5
font_01_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 10740 bytes
SHA-256: 1d2d6f3f534202a8f38a2b5c716dd063ecc92ad33555696ad42884e942ad01aa
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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