Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e400bf8aaff480…

MALICIOUS

PDF

98.1 KB Created: 2021-07-22 12:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da46d8c3999a6e0a46ebb3159fef20e5 SHA-1: b06eea95bfa394389183a188b43d912b89990378 SHA-256: 87e400bf8aaff48024aef8b4c9fa65019e7b164cd3f944a08e728fc53096c40a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://alisawedding.com/upload/users/files/45201061068.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dfed6ab36---48199960745.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jl4a7p8na7atlv179e4n1264b0/16173946016.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/jilitoxikokosul.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078f844d97e3---9349257296.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b56491d84---12597222695.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ed7cdfc0---jaxodotol.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a83532b0eb7---wakokamilitotesezoduz.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d64554e0c---batokerevokopilosororola.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a69deb6d7717e90122fb11cdabdfdff6/22166023507.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/74667539826.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/lodunazaj.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/tupekafenuzuba.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839b944ae36---gozuvozafiwutusiz.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/88224768671.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/kesenizofusogipetup.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070203537497---2934587957.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/robudexeravude.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b646d2bd---15624662903.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/mnethhnkr32hohidksllkj8021/9697891228.pdfIn PDF document text
    • https://0900107678.com/upload/file/91273068935.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/zupizeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=yes+or+no+tarot+reading+a+free+answer+to+your+questionPDF 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://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_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10912 bytes
SHA-256: 9dfcc67c08d8a0ff299437f097afbbe659a325369dcc60599cdd63ce55b1c802
font_01_sfnt_off000136f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F6 17572 bytes
SHA-256: 836ba160c407ed00b93460dd7ab7f443f8188681416254dd30cd1f469b631343
font_02_sfnt_off000164c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1