Malicious PDF — malware analysis report

Static analysis result for SHA-256 72eaf46505c24524…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 15:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4917696edfda1ba0c3ff64089a5ec1ca SHA-1: ccd88e8d5e130d5f1eb5a963488813ccc5f366d3 SHA-256: 72eaf46505c245240bf06f419854b9f7876aa720b3ace3a29ea3b2dee48a8b08
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, directing users to multiple compromised WordPress sites hosting other PDF files, suggesting a multi-stage attack. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://progfin.pl/userfiles/file/zibedokikedukivikizo.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/5a45e6168e2ce50ef86e1c9ff86c6ae2/parif.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be70669225---kapunoxolefegib.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/zevunajepupiwukidefifub.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c698c53bb90a0500a7592615fe396fc0/4521107308.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/rusewavizuzekavalad.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160761597d3c70---90805300289.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/48216231631.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/naguduxesax.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e5902d77---rodixixerebobezinisazevi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e84f4eb8906724b58b50f68db9957b19/pajuduwabonovipuwufuw.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de463b6f3---japajikadokelojiwanoli.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/36250429090.pdfIn PDF document text
    • http://melabo.com/upload/files/miwawowofawatox.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rpfdrtp1l96kddrncto7ucj3v2/gigutebek.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/guxitelagewiwagewowesa.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/8015617500.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/61481269157.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/48572317741.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/66684466058.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/bisilori.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/mexalereveju.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/55620321190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=meaning+of+erosion+in+sciencePDF 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_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10360 bytes
SHA-256: 76f5df4b3e18a08d6639e1482427f67b51ef1e0cc55b4c248db932b65a7721d7
font_01_sfnt_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 18604 bytes
SHA-256: ca787fa82ec58ac88829cf8c503c021e8f89cb939a5bbf5e8e751714be1f6b79
font_02_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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