Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd321fe80f319fd…

MALICIOUS

PDF

132.9 KB Created: 2021-09-06 08:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abc804d97bc7d0076e0bf2243595ac2b SHA-1: 15373f8bccc63ffd71f68a8f087146eb2124accb SHA-256: ddd321fe80f319fdd90c68ea4680a0b72c9d289ef6ff25dde4963f0f3579c0ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd29c2520e6---31479142073.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ibd7qc3lor7g3363jp2vqp5q3t/besotofikedi.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/61034275651.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/28765899873.pdfIn PDF document text
    • https://chptravel.ir/data/file/sapimalakewepusekufodoro.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jetib.pdfIn PDF document text
    • https://nadamasristorante.it/file/35546934396.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/81125843322.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7u472voc91pa1dm10ue5quntk2/75092154180.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a68c164a8---1479339658.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/lafezeg.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/wojirepobuvimemeripenup.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/c2b0861dc72ba3612240be2ebed4dbc0/dowitixisava.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/86115283858.pdfIn PDF document text
    • http://www.andreapondika.cz/file/nunamirafaliretug.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/butifixizewipifet.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fibaluvajilutote.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fujilutovazezog.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c667c13b0be---jamapajubadul.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/113be8a93e53c978e408246aabce48e2/jafedififowemowi.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/nilobojojexiwebidedo.pdfIn PDF document text
    • http://mextro.de/upload/files/44168521974.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/88059640091.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4493db04b4---koxudilataraxujuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=op+amp+circuit+analysis+pdfPDF 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_off00019c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C91 21216 bytes
SHA-256: 18e85a4d32d4cec7784b93bc21bbaf0066e90b14a63b6e4d4d644caea196830c
font_01_sfnt_off0001d477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D477 10768 bytes
SHA-256: 093275f7fdebc89efc1819aca3ac6b802dd902ea0a0233c2d23364f2d843a226
font_02_sfnt_off0001ed50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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