Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ceb2feedb9e8c5…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 03:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 125bfcecf209ba8689441b0dd47018aa SHA-1: f17f9d8a5c62791d5ba864cbdba4b01e7553ea83 SHA-256: 96ceb2feedb9e8c58b41ab40ea51c2c5b8e579c031a841a6212eff7e504484f1
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 a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as redirects to phishing pages or malware download sites, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n70ikmhiue98kls037nnfpkbth/kefimalemi.pdf In PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49e7116d7---24277183.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jenegom.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2668996164cc34fc2e77cbf72e9a05c0/68404822312.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/96716618692.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/62688810131.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/datekeburimi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/5t94d3fmbtr89e7vqijnpbj0l1/vinixeginefivibogamonidaf.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9c5d8174742f366f3b7b71c5174a91a4/48486709161.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ja7gv93233c6h1iomf8mk0g65i/81521950303.pdfIn PDF document text
    • https://akbaturgame.com/calisma2/files/uploads/reredibibikagejiposegopi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b5636492f138986a7c913f192361710e/92979303870.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/99863997127.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c67b926eb28---wawaxewarubakex.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39695825ed---91107279651.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/zebunavevuvivogunevoki.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607060825fc4d---logulirowo.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/43738070443.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/kffhd7b6mifb97da2vsuerl00r/64296415616.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/98514886467.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/veduk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=sysmex+xe+2100+manualPDF 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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 10544 bytes
SHA-256: 8f445e6864481093c9e1b711a6eb62db3a149b013483118c9881b2ee75da3e63
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 19264 bytes
SHA-256: 51a14217d5249811e06373a0e4b33d2420386d6c2080e647e09306db03701ba4
font_02_sfnt_off00012f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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