Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd96e419dbbb021…

MALICIOUS

PDF

73.0 KB Created: 2021-10-06 19:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0511b977c0ae7f73a58d2ab31cb2ac1 SHA-1: b9fcb9f43aa39e844eba3fc9b95c07315f1bcc57 SHA-256: 5cd96e419dbbb0218e9ea8d82dc22fe9aac78b83c9c3546c246740a3b6940a82
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a document that, while not containing readable text, functions as a gateway to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ecohort.com/userfiles/files/23525467643.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16143a065e874c---78093494810.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/5288474303.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/jizakupewizi.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/pajasusukap.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/21877498764.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/bodofodivawimixezotarewol.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/24505839020.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/34005792020.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/44497156767.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xujuzedufinisirususe.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd36ca1468---potivi.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/34496492535.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/40165671097.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/fasopofipivaw.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/82446607110.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614217167e84c---38082815480.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/02cced9e43421ce4d47a50e4391d8674/nefenetuvufuxixalaker.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/22803717263.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd0c8568bc---saroxabi.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/82474094113.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/70873672974.pdfIn PDF document text
    • http://rococosofa.com/files/files/43910474457.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614806f1da9bb---81691436710.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=precise+but+not+accurate+examplePDF 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_off0000bb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1D 10880 bytes
SHA-256: a9c85622ecb1c3c303fb5313026ce6d7ba8ea2f230e517586f1f7f1a2dbdb778
font_01_sfnt_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16828 bytes
SHA-256: e551f62ad15b3068f9b0abaef69ce8d1d3246affde9d6f4c5a58e6406987477a

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