Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b461146714925b…

MALICIOUS

PDF

84.5 KB Created: 2021-07-14 03:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d91e026d37bfa3403215e5f6429b70b2 SHA-1: cdd3307369094de1d6461fef7d62bdfe7a44d381 SHA-256: 72b461146714925bd0662dcc75a7c9536caafd86e647ffb39e401d7acdbb4517
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=variant+resistant+to+vaccine PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac61c608a8c---remerisa.pdfIn PDF document text
    • http://armanetti.com/images/86503256180.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/97012044368.pdfIn PDF document text
    • https://bdcomunicazione.it/file/mumudegoxiwizidafejeres.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehkhhq568ah825f1afsk0c87lt/nufenesanovuleget.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/facde6d9ace2f6fcbfbd8aba3374db6d/kunasojigugixufo.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/59599581385.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/guzatosomewu.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/86266454588.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/103fa6f47cc67a4cf9671468152a95b2/juneru.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160795f67c8095---potulexowunesorelog.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086386e0a4ae---82559467213.pdfIn PDF document text
    • https://hgb.se/filer/file/99816127477.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059daabd59---regasomudemenojiroz.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/734043593.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc811061fba---28702119473.pdfIn PDF document text
    • https://t2sc.me/userfiles/ledopamemevevadoxote.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d8be2211de6---kovonoripamefumiwemojum.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/matoxemabuvinunarogosa.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/torosuzefelajidadereneb.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rvu8s96f69n8d4rivm915a1206/22999418191.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/76dhq91n4352kquoh791p2289q/libejixunuz.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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10212 bytes
SHA-256: b768499fe2f03f830d49f1a81055db75a1e8d0d5ce49ad6bca15e1b59f1be3b7
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 17452 bytes
SHA-256: 4b781120396c98c4b0318e1399a3a1a9fcf56ec8e895c85e4dd667140390f988

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