Malicious PDF — malware analysis report

Static analysis result for SHA-256 aecb93a7801f5d23…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 04:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cdf075350840d3e0518fd05f90cb7459 SHA-1: 8e321831ac919ba8dcb5310e1da5c2e51cfe1be2 SHA-256: aecb93a7801f5d234ffd7755f6e6acae70ab1969529509072bbd94dcec516e33
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern appears to be phishing or malware distribution through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://scro.ru/pic/file/letini.pdf In PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/tesodavopuwaxozumezumebuw.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/wosoma.pdfIn PDF document text
    • https://zzwgjx.com/d/files/17437718281.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5328035ed---9983344657.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/gapimegisexofasikozezir.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e3dd43c1b---47648155522.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160989cbb5af94---xulawosu.pdfIn PDF document text
    • http://tecumseh1962.com/clients/85183/File/tagifozadedusegeg.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b5a898674---luzifeluvon.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/aqj76vgsihrhsdcnhr838seg3p/48068194171.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/68854750993.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/46087528008.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/medokuregebitodebegamu.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/35638690274.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pezulokutakifuwapuxuxul.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/69030525021.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160799e00a8913---59673266017.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/wifejezetifolosenop.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/laxunafepugugipawuxeso.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/091f9b5e46faa830d667d136fdef66e0/wulatalaleba.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/zibilabo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/3fcf1b73f0c89bac13fddd7be40a0741/vokipaxavulubodepa.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/vugavuzefu.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/99069679690.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/15837731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=osteoporosis+guidelines+2019+pdfPDF 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_off0000c35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35C 11100 bytes
SHA-256: 85edf5b8485797b1a5556f5036b24738cbc58318768df02365b7ace52d11c8a9
font_01_sfnt_off0000dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 16196 bytes
SHA-256: 2238d7e104b621cc398331019a76be8117b78c527880cd5736fc13cc52c6587b

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