Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbc70ac6014735f…

MALICIOUS

PDF

97.8 KB Created: 2021-09-07 10:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcb7872cb385f2c5570081143c0c3824 SHA-1: 2ac90fc467997f07f8ac896bfbd304e1fed056ff SHA-256: fbbc70ac6014735f3d53d5e0cffe0f33ff2faded9ec3aca5a1850b3013b0f0b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The PDF structure itself is also noted as a link farm, further supporting this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://irlanc.ru/uplcv?utm_term=diccionario+de+sinonimos+y+antonimos+maria+moliner+pdf PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8049c3b2fc---71431878221.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/30717449382.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/80820718723.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/patubexaliboxikedagekamez.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8701f0b17---78254591458.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/rapuxolibij.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/912204994.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/vofakujaga.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/42120366176.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/wofesojodadera.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cf4559846---58453660020.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86lqklpkif043an9pmiadkj032/bekiv.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/zowomiwa.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/58293608713.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02275e106---xibat.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mudajosunixagolosubis.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/fee6b902c2bf101902df6c2d209e65e8/97159424277.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gn43ofjpkvk8qepu5dmr35v4l2/fisijimidako.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611411c13af30---xabofarib.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/ee18a3deeaa5888e79d1302c20cc75f9/rijadutamowiwogatagesaj.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/ributawiviveluvapuzub.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/41624131275.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833caa23665---72562700101.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba3e8508a---pawerapikezip.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_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 21284 bytes
SHA-256: 7a6a40e80dcbb84633ada0d348a823dd224aa49f0ef75f4e7db2d0a3361539dc
font_02_sfnt_off00015dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DDA 10896 bytes
SHA-256: 843ae8601cbb9d4ecb2e541636a827e297b85ee3d1a4e1a0077ec7fbc742492b

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