Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d21cf7dd72bdc8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-07 20:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: edd935b10932074bf9bd2f6a82d5d108 SHA-1: 8f2ea5ede1d871d877d250e42c01c7853bdc75b3 SHA-256: f3d21cf7dd72bdc801a21c4982d50c6f3fa5501a2f414eef8a57910b244b5daf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/d9u6if8jhqeqrkj8i3gqecaf12/rusewagojigidew.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af3817b0cee---11657223724.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d678218915---duvekorunamevefivifisaj.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/41618351468.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d688bd1fbca---30613418492.pdfIn PDF document text
    • http://oembag.com/uploads/files/202108182253341989.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/94503067179.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608006299b3a3---ririjatijodapupezuru.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/7461448108.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5bo9bi0r6qqplogvensin4chf6/52877268241.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/92021646776.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/fokaxasozupitulokofenow.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d44be1d233---motojatamamuguk.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c79479e5---71778446435.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/76388381954.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0na25t88hf6tpg45qnr9l5hns3/63911901386.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094103ba9155---41706869039.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/winobadizajovudodoger.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e98ba0a4---49278038137.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/85103884875.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210714_5F0A3A5D5CD93188.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/40420237541.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kejoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=funcion+del+acido+folico+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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 10324 bytes
SHA-256: dba8d8578b089f8a58aecbb0c3071ad3af5bbb35003d24d4e2c54773ac1f9839
font_01_sfnt_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 16284 bytes
SHA-256: cadf3eb8bba495583463c209340588594d7bf50fcb169cf1097dcf50ec4cb358
font_02_sfnt_off0000f48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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